I am running a stage 4 Magicka Templar vampire- a sneakplar if you will. Mainly in Cyrodiil. I've noticed that when I am in sneak and use Purifying Light to open up my combo it will stun the enemy player and do a lot of damage that I don't think it should be doing. For example, last night I was hitting folks with 12k - 15k Purifying Light non-crit coming out of stealth without even casting anything else or damaging or debuffing them before hand (and it would stun them too). My fully buffed tooltip for Purifying Light is only 4-5k and around 14k maximum copied damage. I also critted a few folks for 22k+ just by pressing the Purifying Light ability while in sneak.
I'm pretty sure it's bugged unless there was a change to it I am not aware of last patch?
It might also be my gear. Here is my lay out:
5x War Maiden on body.
2x Mighty Chudan monster set
Vampire Lord set on Inferno Staff, Restoration staff, and jewelry.
Swift traits on all jewelry
Increased spell damage on all jewelry
Sharpened trait on Inferno staff w/ drain health poison IX
Defending trait on Restoration staff w/ increased damage enchant
7x impenetrable trait on armor
7x prismatic defense glyphs on armor (tri stat glyphs)
Breton is the race
I tested it on the Stormfist clan NPCs in Eastmarch and it hit for 21,576 exactly each and every time, non-crit, regardless if it was a squishy mage or big meaty buffed dudes. It would also stun them every time. Something else I noticed is that it does not do the stun nor the really high damage if I attack from sneak while facing them. It only happens when I'm to their side or directly behind them. It doesn't stun nor do the really high damage if I am not in stealth/sneak. It also doesn't do the stun or crazy high damage if I run for three seconds to get the hidden/invisible mist thing from the vampire stage 4 passives and then press the Purifying Light ability.
So, sneak bug perhaps?