At the top of the tower, you'll see three goblins. The middle one is the place holder for Lord-B, the cleric epic mob. The ones on the sides are your tainted place holders. And yeah, it's one of the more annoying camps
[You must be logged in to view images. Log in or Register.]. I think even "fake" tainted can spawn, if I remember correctly.. that when killed, don't spawn a corrupted.
Hang in there.