Mabrothrax

Also known, incorrectly, as the Plague Elemental, the Mabrothrax is in fact a solitary Greater Daemon. It is said that it is a servant of the Chaos god Nurgle, the Lord of Corruption, but little is known of its true nature. It can manifest itself as a foul, stinking wind, but it is most effective when it takes physical form. On those occasions when it does appear in the material world, the Mabrothrax spreads disease and pestilence, wiping out whole populations.

When in physical form, the Mabrothrax appears as a hunched, decaying humanoid figure which stands about 12 feet tall when fully erect. It has the appearance of a month-old corpse, and its skin is covered in festering boils. Bones and internal organs protrude in the places where its skin has rotted away.

Source
Mabrothrax
 * Warhammer Fantasy RPG 1st ED -- Core Rulebook
 * pg. 257
 * pg. 258

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