Humbaba

Concept: “‘Humbaba, whose shout is the flood weapon, whose utterance is Fire and whose breath is Death’”
Content: An ancient Mesopotamian monster adapted to Mörk Borg
Writing: Purely mechanics; some flavor text on the product page
Art/design: Layout is a bit top-heavy but not detrimentally so
Usability: Some specific death conditions could make this a recurring antagonist