First off, I am a nightblade. When debuffing a target in PVP or PVE from stealth, using marked target works like a charm. It will not unstealth me, mark the target, and debuff as it is supposed to.
Elemental drain on the otherhand from the destro staff tree, seems to be bugged. If I have any type of damage on my staff as its charge, it will deal damage to my target while debuffing them. Essentially I pull aggro the second I press the debuff. If I put on a staff with no proc, I can debuff until my heart is content and never aggro anything.
Doesn't seem like a huge deal in a raid, but in PVP it will instantly unstealth me, and makes it impossible to check how well my DPS is doing since the timer starts the second I deal any damage.
I also didn't seem to see any damage increase from using it. Not sure it is working properly all around besides the magicka restoration aspect.
Surgical Incision
Former Emperor
USPS4