MobFactory.h

#pragma once

#include <string>

class Level;
class Mob;
class TileSource;
class Vec3;
class Vec2;

class MobFactory {

public:
	MobFactory(Level &);
	Mob *CreateMob(int entityType, TileSource &ts, const Vec3 &position, Vec2 *rotation);
	
};

SomeItemClass.cpp

...

// could be any class, this is just an example
// anywhere you can get a Level instance, you could spawn a mob by the same method
class SomeItem : public Item {

public:
  ...
  
  virtual void use(ItemInstance&, Player &player) {
    
    // 32 = zombie
    player.level->mobFactory->CreateMob(32, player.region, player.getPos(), player.getRotation());
    
  }
  
  ...
}