I like that it's designed to be dropped into any existing campaign.
It might increase legibility to add a bit more spacing between the text columns, as well as making the headings bold or in a different font.
I liked the map illustration, it was very usable. The stair man drawing was great too, the Incandescents and the Crystalline Vulture are begging for a similar treatment.
The Assumptions section up front is useful, so readers can get a grip of the most important ideas right away. The Hooks section was also great.