The Cadaverous Carrion is a post-Moon Lordsentry that drops from The Old Duke. It summons a grounded Old Duke head sentry, the sentry rapidly fires homing Sulphurous Sharknadoes at nearby enemies.
Its best modifier is Ruthless. The Mythical modifier provides the widest array of stat bonuses, but these primarily affect the initial summon rather than the resulting minion. Additionally, minions cannot deal critical hits. The only lasting advantage a Mythical Cadaverous Carrion has over a Ruthless one is knockback.
'Cadaverous' means "resembling a corpse", and 'carrion' is "the decaying flesh of an animal".
The Old Duke head is named "Absolutely Disgusting Shark Puker".