Mardagg

Sometimes mistakenly called the Death Elemental, the Mardagg is a Greater Daemon, serving the Chaos god Khorne. When a Mardagg is summoned, it does one thing and one thing only – it kills. The killing spree of a Mardagg can only be ended by banishing it to its home plane, either by 'killing' its physical form or by magical means.

The Mardagg appears as a huge robed and hooded skeleton, over 10 feet tall. It is typically armoured in chain mail, and carries an immense scythe.

The Mardagg terrifies all living things.

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

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