Terrorchem
From Warhammer 40k - Lexicanum
Terrorchems are virulent toxins used by the Night Lords.[1]
Description
They can be used to coat the blades of Nemesis Claw Fearmongers. One scratch from these weapons can spell the doom for even the toughest opponent, as the Terrorchems cause their wounds to continue to bleed. The toxins also have the same effect, when they are used on explosives that are hidden in booby-trapped objectives.[1]