Ever since the enemy AI updates, this issue with Deprive the Unworthy has become a real hassle. I've seen it mentioned on the forums before in the context of Noonfrost, but whenever this Paladin ability is used by an enemy it autohits.
Enemy Paladins consistently debuff with it, and the combat log shows no saving throw (and, indeed, I have never been anything other than hit by it). Felisa, the Fampyr Paladin in Russetwood hits for 27 seconds with it. I can provide a save if necessary, but I've run into this on a number of playthroughs and this should be easily reproducible. It wouldn't be such a big deal if it weren't an incredible debuff or if there were any means of countering it. As it stands, once it's on, it's on. Even applying Suppress Afflictions doesn't do anything.
Also of note in this battle are the Fampyr Beguilers - their Combusting Wounds spells also autohit and do not register as spells for the purposes of Arcane Reflection. I think I ran into a similar issue in the opening of the Siege of Cragholdt. I'll see if I can another save and reproduce that one as well.
In all seriousness, though, thank you all for your hard work. These last few patches have been great.