[Zarr]

There is a bug some people have in the game were one of the greater wolfweres in Firkraag's dungeon regenerates impossiblly fast - ie faster than normal. I'm guessing but you may have this bug. I always get it myself personally.

If this is the case you won't be able to kill it by normal means your only hope would be if you have Yoshimo or another skilled thief to set a ton of traps and then have every one attack it.

To test wether you have the bug lock it in a corridor and continue on with the dungeon. Without wanting to give too much away(if you haven't played the dungeon before) you'll encounter another greater wolfwere this one not bugged. I bet you kill it easilly!