Godot 3d tutorial: https://docs.godotengine.org/en/stable/getting_started/first_3d_game/07.killing_player.html

main.gd

@@ -0,0 +1,14 @@
+extends Node
+
+@export var mob_scene: PackedScene
+
+func _on_mob_timer_timeout():
+	var mob = mob_scene.instantiate()
+	
+	var mob_spawn_location = get_node("SpawnPath/SpawnLocation")
+	mob_spawn_location.progress_ratio = randf()
+	
+	var player_position = $Player.position
+	mob.initialize(mob_spawn_location.position, player_position)
+	
+	add_child(mob)