Tried to snare one (actualy darkness) and it said "Your target is immune to changes in its run speed" exact quote. Not sure if root/immo is considered a change in run speed.
I haven't been able to get an Immobilize spell to stick on a bat after 30 or so casts. I have tried Maloing them before and it doesn't make a difference. Dont' bother, just melee them and hit them with fast casting DD spells.
Harun Al'Rashid Barbarian Shaman of 51 Seasons Des Cendres - Mithaniel Marr
It tells you that they are 100% resistant to any types of spells that slow their movement speed. That being snare and root resistance. Exp really isn't that great, so might as well hunt the wolves.