Concept: “At any time and place in this doomed world, a sarcophagus could appear that was not there the day before.”
Content: Hook and mechanics for an undead (but surprisingly good-natured) fighting pit
Writing: Lots of descriptive details, a stable of fun mechanical features, and some interesting variables
Art/design: Art and layout are very on-brand but with their own unique flavor
Usability: Logical, efficient sequential flow