feat(backend): Implement base framework for Perks, Skills, and Derived Stats

api/services/models.py

@@ -79,8 +79,9 @@ class InitiateCombatRequest(BaseModel):
 
 
 class CombatActionRequest(BaseModel):
-    action: str  # 'attack', 'defend', 'flee', 'use_item'
+    action: str  # 'attack', 'skill', 'flee', 'use_item'
     item_id: Optional[str] = None  # For use_item action
+    skill_id: Optional[str] = None  # For skill action
 
 
 class PvPCombatInitiateRequest(BaseModel):

api/services/skills.py

@@ -0,0 +1,178 @@
+"""
+Skills service - loads skill definitions and provides skill availability logic.
+"""
+import json
+from typing import Dict, Any, List, Optional
+from pathlib import Path
+
+
+class Skill:
+    """Represents a combat skill."""
+    def __init__(self, skill_id: str, data: Dict[str, Any]):
+        self.id = skill_id
+        self.name = data.get('name', skill_id)
+        self.description = data.get('description', '')
+        self.icon = data.get('icon', '⚔️')
+        self.stat_requirement = data.get('stat_requirement', 'strength')
+        self.stat_threshold = data.get('stat_threshold', 0)
+        self.level_requirement = data.get('level_requirement', 1)
+        self.cooldown = data.get('cooldown', 3)
+        self.stamina_cost = data.get('stamina_cost', 5)
+        self.effects = data.get('effects', {})
+
+
+class SkillsManager:
+    """Loads and manages skill definitions from JSON."""
+    
+    def __init__(self, gamedata_path: str = "./gamedata"):
+        self.gamedata_path = Path(gamedata_path)
+        self.skills: Dict[str, Skill] = {}
+        self.load_skills()
+    
+    def load_skills(self):
+        """Load skills from skills.json."""
+        json_path = self.gamedata_path / 'skills.json'
+        try:
+            with open(json_path, 'r') as f:
+                data = json.load(f)
+            
+            for skill_id, skill_data in data.get('skills', {}).items():
+                self.skills[skill_id] = Skill(skill_id, skill_data)
+            
+            print(f"⚔️ Loaded {len(self.skills)} skills")
+        except FileNotFoundError:
+            print("⚠️  skills.json not found")
+        except Exception as e:
+            print(f"⚠️  Error loading skills.json: {e}")
+    
+    def get_skill(self, skill_id: str) -> Optional[Skill]:
+        """Get a skill by ID."""
+        return self.skills.get(skill_id)
+    
+    def get_all_skills(self) -> Dict[str, Skill]:
+        """Get all skills."""
+        return self.skills
+    
+    def get_available_skills(self, character: Dict[str, Any]) -> List[Dict[str, Any]]:
+        """
+        Get all skills available to a character based on their stats and level.
+        Returns list of skill dicts with availability info.
+        """
+        available = []
+        for skill_id, skill in self.skills.items():
+            stat_value = character.get(skill.stat_requirement, 0)
+            level = character.get('level', 1)
+            
+            unlocked = (stat_value >= skill.stat_threshold and level >= skill.level_requirement)
+            
+            skill_info = {
+                "id": skill.id,
+                "name": skill.name,
+                "description": skill.description,
+                "icon": skill.icon,
+                "stat_requirement": skill.stat_requirement,
+                "stat_threshold": skill.stat_threshold,
+                "level_requirement": skill.level_requirement,
+                "cooldown": skill.cooldown,
+                "stamina_cost": skill.stamina_cost,
+                "unlocked": unlocked,
+                "effects": skill.effects,
+            }
+            available.append(skill_info)
+        
+        return available
+
+
+class Perk:
+    """Represents a passive perk."""
+    def __init__(self, perk_id: str, data: Dict[str, Any]):
+        self.id = perk_id
+        self.name = data.get('name', perk_id)
+        self.description = data.get('description', '')
+        self.icon = data.get('icon', '⭐')
+        self.requirements = data.get('requirements', {})
+        self.effects = data.get('effects', {})
+
+
+class PerksManager:
+    """Loads and manages perk definitions from JSON."""
+    
+    def __init__(self, gamedata_path: str = "./gamedata"):
+        self.gamedata_path = Path(gamedata_path)
+        self.perks: Dict[str, Perk] = {}
+        self.load_perks()
+    
+    def load_perks(self):
+        """Load perks from perks.json."""
+        json_path = self.gamedata_path / 'perks.json'
+        try:
+            with open(json_path, 'r') as f:
+                data = json.load(f)
+            
+            for perk_id, perk_data in data.get('perks', {}).items():
+                self.perks[perk_id] = Perk(perk_id, perk_data)
+            
+            print(f"⭐ Loaded {len(self.perks)} perks")
+        except FileNotFoundError:
+            print("⚠️  perks.json not found")
+        except Exception as e:
+            print(f"⚠️  Error loading perks.json: {e}")
+    
+    def get_perk(self, perk_id: str) -> Optional[Perk]:
+        """Get a perk by ID."""
+        return self.perks.get(perk_id)
+    
+    def get_all_perks(self) -> Dict[str, Perk]:
+        """Get all perks."""
+        return self.perks
+    
+    def check_requirements(self, perk: Perk, character: Dict[str, Any]) -> bool:
+        """Check if a character meets a perk's requirements."""
+        for req_key, req_value in perk.requirements.items():
+            if req_key.endswith('_max'):
+                # Max constraint (e.g., endurance_max: 8 means END must be ≤ 8)
+                stat_name = req_key.replace('_max', '')
+                if character.get(stat_name, 0) > req_value:
+                    return False
+            else:
+                # Min constraint
+                if character.get(req_key, 0) < req_value:
+                    return False
+        return True
+    
+    def get_available_perks(self, character: Dict[str, Any], owned_perk_ids: List[str]) -> List[Dict[str, Any]]:
+        """
+        Get all perks with availability status for a character.
+        """
+        available = []
+        for perk_id, perk in self.perks.items():
+            meets_requirements = self.check_requirements(perk, character)
+            owned = perk_id in owned_perk_ids
+            
+            perk_info = {
+                "id": perk.id,
+                "name": perk.name,
+                "description": perk.description,
+                "icon": perk.icon,
+                "requirements": perk.requirements,
+                "effects": perk.effects,
+                "meets_requirements": meets_requirements,
+                "owned": owned,
+            }
+            available.append(perk_info)
+        
+        return available
+
+
+# Perk points per level
+PERK_POINT_INTERVAL = 5  # Every 5 levels
+
+
+def get_total_perk_points(level: int) -> int:
+    """Calculate total perk points available for a given level."""
+    return level // PERK_POINT_INTERVAL
+
+
+# Global instances
+skills_manager = SkillsManager()
+perks_manager = PerksManager()

api/services/stats.py

@@ -0,0 +1,225 @@
+"""
+Central stat calculation service.
+All derived stats are computed here from base attributes + equipment + buffs.
+Results are cached in Redis and invalidated on any change.
+"""
+import json
+from typing import Dict, Any, Optional, List
+from .. import database as db
+from ..items import items_manager as ITEMS_MANAGER
+
+
+# ─── Game Config (raise per expansion) ───
+STAT_CAP = 50          # Max base stat points per attribute
+MAX_LEVEL = 60         # Max character level
+POINTS_PER_LEVEL = 1   # Stat points granted per level
+
+
+async def calculate_derived_stats(character_id: int, redis_mgr=None) -> Dict[str, Any]:
+    """
+    Calculate all derived stats for a character.
+    Checks Redis cache first; if miss, computes from DB and caches result.
+    
+    Returns dict with all derived stat values.
+    """
+    # 1. Check Redis cache
+    if redis_mgr and redis_mgr.redis_client:
+        try:
+            cached = await redis_mgr.redis_client.get(f"stats:{character_id}")
+            if cached:
+                return json.loads(cached)
+        except Exception:
+            pass  # Graceful degradation — recalculate if Redis fails
+    
+    # 2. Fetch data from DB
+    char = await db.get_player_by_id(character_id)
+    if not char:
+        return _empty_stats()
+    
+    equipment = await db.get_all_equipment(character_id)
+    effects = await db.get_player_effects(character_id)
+    
+    # 3. Fetch owned perks
+    owned_perks = await db.get_character_perks(character_id)
+    owned_perk_ids = [row['perk_id'] for row in owned_perks]
+    
+    # 4. Compute derived stats
+    stats = _compute_stats(char, equipment, effects, owned_perk_ids)
+    
+    # 5. Cache in Redis (5 min TTL)
+    if redis_mgr and redis_mgr.redis_client:
+        try:
+            await redis_mgr.redis_client.setex(
+                f"stats:{character_id}", 300, json.dumps(stats)
+            )
+        except Exception:
+            pass
+    
+    return stats
+
+
+def _compute_stats(char: Dict[str, Any], equipment: Dict[str, Any], effects: List[Dict], perk_ids: List[str] = None) -> Dict[str, Any]:
+    """Pure computation of derived stats from base data."""
+    strength = char.get('strength', 0)
+    agility = char.get('agility', 0)
+    endurance = char.get('endurance', 0)
+    intellect = char.get('intellect', 0)
+    level = char.get('level', 1)
+    if perk_ids is None:
+        perk_ids = []
+    
+    # ─── Base derived stats from attributes ───
+    attack_power = 5 + int(strength * 1.5) + level
+    crit_chance = 0.05 + (agility * 0.005)
+    crit_damage = 1.5 + (strength * 0.01)
+    dodge_chance = min(0.25, 0.02 + (agility * 0.005))  # Cap 25%
+    flee_chance_base = 0.4 + (agility * 0.01)
+    max_hp = 30 + (endurance * 5) + (level * 3)
+    max_stamina = 20 + (endurance * 2) + level
+    status_resistance = endurance * 0.01
+    block_chance = 0.0
+    item_effectiveness = 1.0 + (intellect * 0.02)
+    xp_bonus = 1.0 + (intellect * 0.01)
+    loot_quality = 1.0 + (intellect * 0.005)
+    crafting_bonus = intellect * 0.01
+    carry_weight = 10.0 + (strength * 0.5)
+    
+    # ─── Equipment bonuses ───
+    total_armor = 0
+    weapon_crit = 0.0
+    weapon_damage_min = 0
+    weapon_damage_max = 0
+    has_shield = False
+    
+    for slot, item_data in equipment.items():
+        if not item_data or not item_data.get('item_id'):
+            continue
+        
+        # Get inventory item to find the item definition
+        inv_item_sync = item_data  # equipment dict already has item_id reference
+        item_def = ITEMS_MANAGER.get_item(inv_item_sync.get('item_id', ''))
+        
+        # Try to get item_id from the inventory item if the direct lookup failed
+        if not item_def:
+            continue
+        
+        if item_def.stats:
+            total_armor += item_def.stats.get('armor', 0)
+            weapon_crit += item_def.stats.get('crit_chance', 0)
+            
+            if slot == 'weapon':
+                weapon_damage_min = item_def.stats.get('damage_min', 0)
+                weapon_damage_max = item_def.stats.get('damage_max', 0)
+        
+        if slot == 'offhand':
+            has_shield = True
+    
+    # Apply equipment to derived stats
+    crit_chance += weapon_crit
+    armor_reduction = total_armor / (total_armor + 50) if total_armor > 0 else 0.0
+    
+    if has_shield:
+        block_chance = strength * 0.003
+    
+    # ─── Buff effects ───
+    for effect in effects:
+        effect_name = effect.get('effect_name', '')
+        value = effect.get('value', 0)
+        # Future: apply buff modifiers here
+    
+    # ─── Perk passive bonuses ───
+    if 'thick_skin' in perk_ids:
+        max_hp = int(max_hp * 1.10)  # +10% max HP
+    if 'lucky_strike' in perk_ids:
+        crit_chance += 0.05  # +5% crit chance
+    if 'quick_learner' in perk_ids:
+        xp_bonus *= 1.15  # +15% XP
+    if 'glass_cannon' in perk_ids:
+        attack_power = int(attack_power * 1.30)  # +30% attack
+        max_hp = int(max_hp * 0.80)  # -20% HP
+    if 'survivor' in perk_ids:
+        max_hp = int(max_hp * 1.02)  # Small HP boost from regen perk
+    if 'scavenger' in perk_ids:
+        loot_quality *= 1.10  # +10% loot quality
+    if 'fleet_footed' in perk_ids:
+        # Travel stamina reduction tracked for movement system
+        pass
+    
+    stats = {
+        # Core combat
+        "attack_power": attack_power,
+        "crit_chance": round(crit_chance, 4),
+        "crit_damage": round(crit_damage, 2),
+        "dodge_chance": round(dodge_chance, 4),
+        "flee_chance_base": round(flee_chance_base, 2),
+        # Vitals
+        "max_hp": max_hp,
+        "max_stamina": max_stamina,
+        # Defense
+        "total_armor": total_armor,
+        "armor_reduction": round(armor_reduction, 4),
+        "block_chance": round(block_chance, 4),
+        "status_resistance": round(status_resistance, 4),
+        # Utility
+        "item_effectiveness": round(item_effectiveness, 2),
+        "xp_bonus": round(xp_bonus, 2),
+        "loot_quality": round(loot_quality, 3),
+        "crafting_bonus": round(crafting_bonus, 2),
+        "carry_weight": round(carry_weight, 1),
+        # Weapon info
+        "weapon_damage_min": weapon_damage_min,
+        "weapon_damage_max": weapon_damage_max,
+        "has_shield": has_shield,
+        # Perk flags
+        "has_last_stand": 'last_stand' in perk_ids,
+        "has_resilient": 'resilient' in perk_ids,
+        "has_iron_fist": 'iron_fist' in perk_ids,
+        "has_heavy_hitter": 'heavy_hitter' in perk_ids,
+    }
+    
+    return stats
+
+
+def _empty_stats() -> Dict[str, Any]:
+    """Default stats for error cases."""
+    return {
+        "attack_power": 5,
+        "crit_chance": 0.05,
+        "crit_damage": 1.5,
+        "dodge_chance": 0.02,
+        "flee_chance_base": 0.4,
+        "max_hp": 30,
+        "max_stamina": 20,
+        "total_armor": 0,
+        "armor_reduction": 0.0,
+        "block_chance": 0.0,
+        "status_resistance": 0.0,
+        "item_effectiveness": 1.0,
+        "xp_bonus": 1.0,
+        "loot_quality": 1.0,
+        "crafting_bonus": 0.0,
+        "carry_weight": 10.0,
+        "weapon_damage_min": 0,
+        "weapon_damage_max": 0,
+        "has_shield": False,
+    }
+
+
+async def invalidate_stats_cache(character_id: int, redis_mgr=None):
+    """
+    Delete cached stats for a character. Call this whenever:
+    - Equipment changes (equip/unequip/break)
+    - Stat points allocated
+    - Level up
+    - Buff applied/expired
+    """
+    if redis_mgr and redis_mgr.redis_client:
+        try:
+            await redis_mgr.redis_client.delete(f"stats:{character_id}")
+        except Exception:
+            pass
+
+
+def get_flee_chance(flee_chance_base: float, enemy_level: int) -> float:
+    """Calculate actual flee chance against a specific enemy."""
+    return max(0.1, min(0.9, flee_chance_base - (enemy_level * 0.02)))

gamedata/perks.json

@@ -0,0 +1,194 @@
+{
+    "perks": {
+        "heavy_hitter": {
+            "name": {
+                "en": "Heavy Hitter",
+                "es": "Golpe Pesado"
+            },
+            "description": {
+                "en": "+10% damage with two-handed weapons",
+                "es": "+10% de daño con armas a dos manos"
+            },
+            "icon": "🔨",
+            "requirements": {
+                "strength": 10
+            },
+            "effects": {
+                "two_handed_damage_bonus": 0.1
+            }
+        },
+        "iron_fist": {
+            "name": {
+                "en": "Iron Fist",
+                "es": "Puño de Hierro"
+            },
+            "description": {
+                "en": "Unarmed attacks deal STR × 1 damage",
+                "es": "Los ataques sin armas hacen STR × 1 de daño"
+            },
+            "icon": "👊",
+            "requirements": {
+                "strength": 20
+            },
+            "effects": {
+                "unarmed_str_scaling": 1.0
+            }
+        },
+        "fleet_footed": {
+            "name": {
+                "en": "Fleet Footed",
+                "es": "Pies Ligeros"
+            },
+            "description": {
+                "en": "-20% stamina cost on travel",
+                "es": "-20% de coste de aguante al viajar"
+            },
+            "icon": "🏃",
+            "requirements": {
+                "agility": 10
+            },
+            "effects": {
+                "travel_stamina_reduction": 0.2
+            }
+        },
+        "lucky_strike": {
+            "name": {
+                "en": "Lucky Strike",
+                "es": "Golpe de Suerte"
+            },
+            "description": {
+                "en": "+5% crit chance",
+                "es": "+5% de probabilidad de crítico"
+            },
+            "icon": "🍀",
+            "requirements": {
+                "agility": 20
+            },
+            "effects": {
+                "crit_chance_bonus": 0.05
+            }
+        },
+        "thick_skin": {
+            "name": {
+                "en": "Thick Skin",
+                "es": "Piel Gruesa"
+            },
+            "description": {
+                "en": "+10% max HP",
+                "es": "+10% de vida máxima"
+            },
+            "icon": "🛡️",
+            "requirements": {
+                "endurance": 10
+            },
+            "effects": {
+                "max_hp_bonus_percent": 0.1
+            }
+        },
+        "resilient": {
+            "name": {
+                "en": "Resilient",
+                "es": "Resistente"
+            },
+            "description": {
+                "en": "Status effects last 1 fewer turn (min 1)",
+                "es": "Los efectos de estado duran 1 turno menos (mín 1)"
+            },
+            "icon": "💪",
+            "requirements": {
+                "endurance": 20
+            },
+            "effects": {
+                "status_duration_reduction": 1
+            }
+        },
+        "quick_learner": {
+            "name": {
+                "en": "Quick Learner",
+                "es": "Aprendiz Rápido"
+            },
+            "description": {
+                "en": "+15% XP gain",
+                "es": "+15% de experiencia ganada"
+            },
+            "icon": "📖",
+            "requirements": {
+                "intellect": 10
+            },
+            "effects": {
+                "xp_bonus": 0.15
+            }
+        },
+        "scavenger": {
+            "name": {
+                "en": "Scavenger",
+                "es": "Carroñero"
+            },
+            "description": {
+                "en": "+1 quantity on consumable/resource drops",
+                "es": "+1 cantidad en drops de consumibles/recursos"
+            },
+            "icon": "🦅",
+            "requirements": {
+                "intellect": 20
+            },
+            "effects": {
+                "consumable_loot_bonus": 1
+            }
+        },
+        "survivor": {
+            "name": {
+                "en": "Survivor",
+                "es": "Superviviente"
+            },
+            "description": {
+                "en": "Heal 2% max HP every combat turn",
+                "es": "Cura 2% de vida máxima cada turno de combate"
+            },
+            "icon": "❤️‍🩹",
+            "requirements": {
+                "endurance": 15,
+                "agility": 10
+            },
+            "effects": {
+                "combat_regen_percent": 0.02
+            }
+        },
+        "glass_cannon": {
+            "name": {
+                "en": "Glass Cannon",
+                "es": "Cañón de Cristal"
+            },
+            "description": {
+                "en": "+30% damage, -20% max HP",
+                "es": "+30% de daño, -20% de vida máxima"
+            },
+            "icon": "💣",
+            "requirements": {
+                "strength": 20,
+                "endurance_max": 8
+            },
+            "effects": {
+                "damage_bonus": 0.3,
+                "max_hp_penalty_percent": 0.2
+            }
+        },
+        "last_stand": {
+            "name": {
+                "en": "Last Stand",
+                "es": "Última Resistencia"
+            },
+            "description": {
+                "en": "Once per combat, survive lethal damage with 1 HP",
+                "es": "Una vez por combate, sobrevive daño letal con 1 de vida"
+            },
+            "icon": "💀",
+            "requirements": {
+                "endurance": 30
+            },
+            "effects": {
+                "cheat_death": true
+            }
+        }
+    }
+}

gamedata/skills.json

@@ -0,0 +1,332 @@
+{
+    "skills": {
+        "power_strike": {
+            "name": {
+                "en": "Power Strike",
+                "es": "Golpe Poderoso"
+            },
+            "description": {
+                "en": "A devastating blow with 20% chance to stun",
+                "es": "Un golpe devastador con 20% de probabilidad de aturdir"
+            },
+            "icon": "💥",
+            "stat_requirement": "strength",
+            "stat_threshold": 8,
+            "level_requirement": 5,
+            "cooldown": 3,
+            "stamina_cost": 5,
+            "effects": {
+                "damage_multiplier": 1.8,
+                "stun_chance": 0.2,
+                "stun_duration": 1
+            }
+        },
+        "crushing_blow": {
+            "name": {
+                "en": "Crushing Blow",
+                "es": "Golpe Aplastante"
+            },
+            "description": {
+                "en": "Heavy strike that ignores 50% of enemy armor",
+                "es": "Golpe pesado que ignora el 50% de la armadura enemiga"
+            },
+            "icon": "🔨",
+            "stat_requirement": "strength",
+            "stat_threshold": 15,
+            "level_requirement": 12,
+            "cooldown": 4,
+            "stamina_cost": 7,
+            "effects": {
+                "damage_multiplier": 1.5,
+                "armor_penetration": 0.5
+            }
+        },
+        "berserker_rage": {
+            "name": {
+                "en": "Berserker Rage",
+                "es": "Furia Berserker"
+            },
+            "description": {
+                "en": "+50% damage for 3 turns, but +25% damage taken",
+                "es": "+50% de daño durante 3 turnos, pero +25% de daño recibido"
+            },
+            "icon": "🔥",
+            "stat_requirement": "strength",
+            "stat_threshold": 25,
+            "level_requirement": 20,
+            "cooldown": 6,
+            "stamina_cost": 10,
+            "effects": {
+                "buff": "berserker_rage",
+                "buff_duration": 3,
+                "damage_bonus": 0.5,
+                "damage_taken_increase": 0.25
+            }
+        },
+        "execution": {
+            "name": {
+                "en": "Execution",
+                "es": "Ejecución"
+            },
+            "description": {
+                "en": "300% damage if target below 25% HP, else 100%",
+                "es": "300% de daño si el objetivo está por debajo del 25% de vida, si no 100%"
+            },
+            "icon": "⚰️",
+            "stat_requirement": "strength",
+            "stat_threshold": 40,
+            "level_requirement": 35,
+            "cooldown": 8,
+            "stamina_cost": 8,
+            "effects": {
+                "damage_multiplier": 1.0,
+                "execute_threshold": 0.25,
+                "execute_multiplier": 3.0
+            }
+        },
+        "quick_slash": {
+            "name": {
+                "en": "Quick Slash",
+                "es": "Tajo Rápido"
+            },
+            "description": {
+                "en": "Attack twice at 60% power each",
+                "es": "Ataca dos veces al 60% de poder cada una"
+            },
+            "icon": "🗡️",
+            "stat_requirement": "agility",
+            "stat_threshold": 8,
+            "level_requirement": 5,
+            "cooldown": 2,
+            "stamina_cost": 3,
+            "effects": {
+                "hits": 2,
+                "damage_multiplier": 0.6
+            }
+        },
+        "evade": {
+            "name": {
+                "en": "Evade",
+                "es": "Evadir"
+            },
+            "description": {
+                "en": "Guaranteed dodge on the next incoming attack",
+                "es": "Esquivar garantizado en el próximo ataque recibido"
+            },
+            "icon": "🏃",
+            "stat_requirement": "agility",
+            "stat_threshold": 15,
+            "level_requirement": 12,
+            "cooldown": 3,
+            "stamina_cost": 4,
+            "effects": {
+                "buff": "evade",
+                "buff_duration": 1,
+                "guaranteed_dodge": true
+            }
+        },
+        "poisoned_blade": {
+            "name": {
+                "en": "Poisoned Blade",
+                "es": "Hoja Envenenada"
+            },
+            "description": {
+                "en": "80% damage + poison (3 dmg/turn for 4 turns)",
+                "es": "80% de daño + veneno (3 de daño/turno durante 4 turnos)"
+            },
+            "icon": "🧪",
+            "stat_requirement": "agility",
+            "stat_threshold": 25,
+            "level_requirement": 20,
+            "cooldown": 5,
+            "stamina_cost": 6,
+            "effects": {
+                "damage_multiplier": 0.8,
+                "poison_damage": 3,
+                "poison_duration": 4
+            }
+        },
+        "shadow_strike": {
+            "name": {
+                "en": "Shadow Strike",
+                "es": "Golpe Sombrío"
+            },
+            "description": {
+                "en": "250% damage, guaranteed critical hit",
+                "es": "250% de daño, golpe crítico garantizado"
+            },
+            "icon": "🌑",
+            "stat_requirement": "agility",
+            "stat_threshold": 40,
+            "level_requirement": 35,
+            "cooldown": 7,
+            "stamina_cost": 8,
+            "effects": {
+                "damage_multiplier": 2.5,
+                "guaranteed_crit": true
+            }
+        },
+        "fortify": {
+            "name": {
+                "en": "Fortify",
+                "es": "Fortificar"
+            },
+            "description": {
+                "en": "Reduce incoming damage by 60% for 2 turns",
+                "es": "Reduce el daño recibido en un 60% durante 2 turnos"
+            },
+            "icon": "🛡️",
+            "stat_requirement": "endurance",
+            "stat_threshold": 8,
+            "level_requirement": 5,
+            "cooldown": 3,
+            "stamina_cost": 4,
+            "effects": {
+                "buff": "fortify",
+                "buff_duration": 2,
+                "damage_reduction": 0.6
+            }
+        },
+        "second_wind": {
+            "name": {
+                "en": "Second Wind",
+                "es": "Segundo Aliento"
+            },
+            "description": {
+                "en": "Restore 20% of max HP",
+                "es": "Restaura el 20% de la vida máxima"
+            },
+            "icon": "💚",
+            "stat_requirement": "endurance",
+            "stat_threshold": 15,
+            "level_requirement": 12,
+            "cooldown": 5,
+            "stamina_cost": 6,
+            "effects": {
+                "heal_percent": 0.2
+            }
+        },
+        "iron_skin": {
+            "name": {
+                "en": "Iron Skin",
+                "es": "Piel de Hierro"
+            },
+            "description": {
+                "en": "Immune to status effects for 3 turns",
+                "es": "Inmune a efectos de estado durante 3 turnos"
+            },
+            "icon": "🪨",
+            "stat_requirement": "endurance",
+            "stat_threshold": 25,
+            "level_requirement": 20,
+            "cooldown": 6,
+            "stamina_cost": 8,
+            "effects": {
+                "buff": "iron_skin",
+                "buff_duration": 3,
+                "status_immunity": true
+            }
+        },
+        "adrenaline_rush": {
+            "name": {
+                "en": "Adrenaline Rush",
+                "es": "Subida de Adrenalina"
+            },
+            "description": {
+                "en": "Restore 30% of max stamina (free to use)",
+                "es": "Restaura el 30% del aguante máximo (sin coste)"
+            },
+            "icon": "⚡",
+            "stat_requirement": "endurance",
+            "stat_threshold": 40,
+            "level_requirement": 35,
+            "cooldown": 8,
+            "stamina_cost": 0,
+            "effects": {
+                "stamina_restore_percent": 0.3
+            }
+        },
+        "analyze": {
+            "name": {
+                "en": "Analyze",
+                "es": "Analizar"
+            },
+            "description": {
+                "en": "Reveal enemy HP%, next attack, and weakness",
+                "es": "Revela el % de vida del enemigo, su próximo ataque y debilidad"
+            },
+            "icon": "🔍",
+            "stat_requirement": "intellect",
+            "stat_threshold": 8,
+            "level_requirement": 5,
+            "cooldown": 2,
+            "stamina_cost": 2,
+            "effects": {
+                "reveal_hp": true,
+                "reveal_intent": true,
+                "mark_analyzed": true
+            }
+        },
+        "exploit_weakness": {
+            "name": {
+                "en": "Exploit Weakness",
+                "es": "Explotar Debilidad"
+            },
+            "description": {
+                "en": "200% damage if Analyze was used this combat",
+                "es": "200% de daño si se usó Analizar en este combate"
+            },
+            "icon": "🎯",
+            "stat_requirement": "intellect",
+            "stat_threshold": 15,
+            "level_requirement": 12,
+            "cooldown": 4,
+            "stamina_cost": 5,
+            "effects": {
+                "damage_multiplier": 2.0,
+                "requires_analyzed": true
+            }
+        },
+        "drain_life": {
+            "name": {
+                "en": "Drain Life",
+                "es": "Drenar Vida"
+            },
+            "description": {
+                "en": "100% damage, heal for 50% of damage dealt",
+                "es": "100% de daño, cura el 50% del daño causado"
+            },
+            "icon": "🩸",
+            "stat_requirement": "intellect",
+            "stat_threshold": 25,
+            "level_requirement": 20,
+            "cooldown": 5,
+            "stamina_cost": 6,
+            "effects": {
+                "damage_multiplier": 1.0,
+                "lifesteal": 0.5
+            }
+        },
+        "foresight": {
+            "name": {
+                "en": "Foresight",
+                "es": "Premonición"
+            },
+            "description": {
+                "en": "Enemy's next 2 attacks automatically miss",
+                "es": "Los próximos 2 ataques del enemigo fallan automáticamente"
+            },
+            "icon": "👁️",
+            "stat_requirement": "intellect",
+            "stat_threshold": 40,
+            "level_requirement": 35,
+            "cooldown": 7,
+            "stamina_cost": 7,
+            "effects": {
+                "buff": "foresight",
+                "buff_duration": 2,
+                "enemy_miss": true
+            }
+        }
+    }
+}