Ithragar
From Warhammer - The Old World - Lexicanum
Ithragar was a Dragon captured and killed by Clan Mordkin. [1a]
History
Clan Mordkin ensared the dragon with shock nets and then poisoned, chained and dragged into into their lair. For many weeks it was kept alive and drugged as many litters grew strong feeding on its flesh. Finally it died and its rib cage was made into the gates of the clan fortress. [1a]
End Times
At the Battle of Mordkin Lair, Mannfred von Carstein animated the mortal remains and unleashed it on the skaven. As he departed withe Fellblade, he empowered it with enough magical eneergy to sustain it for a few days. [1b]
Sources