These thinks could be:
- * Materials the rooms are made from, or are used in the creatures cloting etc.
* Which tactics they favor - stealthy, aggressive, likes to play they enemies out against each other, etc.
* Concept art of rooms, creatures, traps, etc.
* Ressource collection and building
The for example the Constructs, I imagine them as very proud, almost fanatically, righteous magical robots. Which have an very similar appearance as the "Golden Army"-robots from Hellboy 2, see this
and this
But it appears that others think of them as cyborgs, judging from some of the entries in the wiki.