These r some of the best pets, get a druid <best> shaman <2nd> (no including enchanters ) and charm these, very sweet pet, makes shamans doggie look like a worthless mut )
But really mostly just on account of their level and how early you encounter them in the keep (can get a pull of a couple after the entry room is clear). Is essential to have an enchanter of high enough level to effect them, but if he is, their MR is pretty weenie. Had an enchanter entrancing ones _8_ levels above him.