Yperite

Concept: “Despite its powerful intellect and psychic powers its body is feeble and suffers from severe flatulence that the creature uses when defending itself.”
Content: Potentially omniscient, extremely flatulent, herbivorous meatsack
Writing: A stat block with multiple, variable specials and a description of its nature and value
Art/design: Page dominated by the illustration with a column of text at left, mostly mechanics
Usability: The flatulence and intellect are a deadly combo