Boss
The Bloom Behemoth
Festival colossus · The Verdant Plague
The Verdant Plague grew something in the drowned cellars under the Market: a hill of mould on legs of root, glowing with spore-caps, breathing green dust over everyone who comes near.
Its mechanic: Spores
Every blow risks a lungful of spores: Blight, -10% to your hunting damage for a day (it stacks, to -50%, and counts out in the Wilds too). Alchemists brew Plague Antidotes that burn it out of your blood.
Rare looks it drops
Everyone who strikes it has a chance at one piece whose look they haven't collected yet. Soulbound, and kept in the Wardrobe for good.