Lacocious the Diseased
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From Diablo Wiki
Lacocious the Diseased, "Lord of the Vermin", is a Superunique Rat Caller that rarely spawns in the Plague Tunnels under the Westmarch Commons in Act V. It uses the Plagued and Desecrator Boss Modifiers. Lacocious the Diseased is one of the monsters to be killed to get the Special Assignment and Irreplaceable You Achievements.