Concept: “Take hold of the Idol of the Silver Muscovy and let its healing magic flow through you, just ignore the feathers poking out from your scalp and your toes beginning to grow webbing...”
Content: A healing artifact that progressively duckifies its users
Writing: Provides the relevant mechanics, descriptions of the item and its location, and ideas and prompts for narrativizing the transformation
Art/design: Primarily textual; uses color to aid navigability, and visual design reinforces the dungeon atmosphere
Usability: Bit more complex than the standard, but still perfectly usable