You see Feverish Citizen
"Aaaaargh!"; "I am the king of the world!"; "Die Ferumbras!".
Notes
Was introducted in the Summer Update 2011. They spawn every 30 minutes in Venore's streets. They won't spawn if people hand in too many Medicine Pouch.
Abilities
Melee (0-5) Poison Wave (causes drunkenness), Bog Raider Mutation.
Damage Taken From Elements
Physical 
Death 
Holy
Ice
Fire
Energy
Earth
Location
Behaviour
Unknown.
Strategy
Just kill it, it's a weak creature.
Loot
0-35 gp, 0-3 Worms, Bone, Luminous Piece of Cloth, Obvious Piece of Cloth, Dubious Piece of Cloth, Voluminous Piece of Cloth, Ominous Piece of Cloth, Ludicrous Piece of Cloth, Plague Bell (very rare), Plague Mask (very rare).