hellhound: can turn fire damage to physical. Damage output was like a lion.
catoplebas: I didn't have it.
Harpy: regenerates a bit (IIRC about crag soarer.) Has good output damage and dodges well. (Like great owl?) Obviously very stronger than other air forms (close to falcon/eagle).
Otyugh: I didn't have. But had BIG dam redux.
Water: has impale (Vampiric touch) which based on the damage it does (is *** against not preped foe) heals yourself. Has auto half-vampiric-touch effects while it attacks too.