Putrid Carapace of Nurgle
From Warhammer 40k - Lexicanum
The Putrid Carapace of Nurgle is a sentient Warp ooze, created by the Plague God, that habitually bonds with Chaos Knights. When worn, the Carapace completely covers a Knight and causes its outer layers of adamantine and plasteel to transform into a bubbling semifluid. This fluid is notable for being capable of melting through the armour and flesh, of any enemy foolish enough to strike the Knight.[1]
Sources
- 1: Codex: Chaos Knights (8th Edition), pg. 69 - Artefacts of Tyranny