Dark energy

they also forgot about unicorns...
and it's unclear about Mages... it's understandable that you can't raise anything from gargoyles and golems... but why can you raise titans (colossi)?
because, as it says in the description of colossi:

Colossi are the most powerful creatures that mages can create or summon. They are created using the same principles as golems.

I don't see any logic here...

P.S. and one more question... what is that horned face from which you can raise a dragon?