Judgement

Fenestra looks like these random tables, which are great, because I can write bullet-points and present it as a system.

Fenestra has only a few creatures, but they really live there. Most of the bestiary is concerned with how they interact with the wider world. What kind of armour can you make from a basilisk's hide? What do griffins eat?   Ecology takes the centre stage.

We end with a revolutionary way to structure adventure modules. Of course I can't tell you what it is, here, in these 16 remaining words, or why would the book have half a chapter on the subject?