Forvalaka

From Glen Cook Wiki

The forvalaka is described as an "undead were-leopard", native to an area near D'Loc-Aloc where One-Eye and Tom-Tom come from. Physically, it looks like an ordinary large black panther, but it is nearly invulnerable to damage, healing wounds in seconds, and blindingly fast; it is said to possess the strength of ten ordinary leopards. One forvalaka can slay a regiment of armed men. When it has time, a forvalaka will drink its victim's blood and take the heart and liver. Sorcery is the only sure way to cope with a forvalaka. It can even defeat a killer Shadow in combat.

A group of nearly 50 forvalaka was imprisoned long ago in a tomb outside Beryl by the local wizards. Apparently immortal, they fought amongst themselves until only one was left, stacking the bones of its vanquished brethren in insane, neat little piles.