Mobs spawning

[FakeTruth]

one thing that comes to my mind, I think entities need a cWorld in their constructor, this might cause trouble.

That may not be necessary? Entities receive their cWorld reference in the Initialize function. This is by design because you may not want to add an entity to a world the moment you instantiate one. You might need to set some entity properties first (is on fire, equipment, speed, etc. etc.) before the entity is added to the world.