Return of Reckoning

Does anyone know a good grinding spot for Banshee & wight mobs? I'm trying to get the 1000 kill tome unlock but haven't come across any good ones.

Cheers

There are some (4-5) on the way to Gerborhest tower (Marshes of Madness), and maybe in some crypts (but usually skeletons in these).

I think there is a crypt in Ostland with banshees, but cannot tell exactly where.