Thratsnik
From Warhammer - The Old World - Lexicanum
Thratsnik was a Grey Seer dispatched to become the spiritual leader of Festerhole.[1a]
History
He possessed a potent magical talisman, the preserved hand of the Warlord Vecteek. [1a]
As he and the other skaven starved, sealed in by Dwarfs, he consumed the talisman and set a trap for any magic user who might use it by cutting off his own paw to be found, inscribiing it with a hidden Rune of of Khorne. Therefore when Thanquol tries to use it summon a Verminlord, to his horror Skarbrand comes instead. [1b]
Sources