Chimaerat
From Warhammer - The Old World - Lexicanum
Chimaerats were mighty warbeasts utilised by the Skaven Master Moulders.
Overview
The rarest of all Clan Moulder's creations, the Chimaerat defies all logic in form. It is a blasphemy against nature that is to a common rat what a Hydra is to a common lizard. Inevitably multi-headed, the Chimaerat wheezes sickly green Warpstone fire as it hauls its benighted bulk across the battlefield, scorching the earth in its wake.