Pretty sure I completed this as an Ardent Flame DK with no issues that I can remember. It's possible I was a higher level than him when attempting, but I don't recall the difficulty standing out to me.

Since this guy is absurdly impossible to kill, I found a workaround: on the left side of the room as you're coming in is a wagon. You can walk through between the wagon and the left wall but he can't (he has to go all the way around the wagon and a pillar). You basically pop out into the room, dot him up, and then go back behind the wagon 'till he comes around the pillar. Then dot him up again and go back to the other side of the wagon. Use a resto staff (even just a crap one) so you can recharge mana and it'll take forever but be doable.

I am also finding it difficult to beat this guy on my DK character, I mean the guy has a stupid amount of health for a VR 2 zone, he has like 9,600 health or something... lol... like really? I beat him on my Sorc character when I came through here but that was after a few tries and then I just used Dark Magic but with my DK I am just not doing it. The closest I got was his health was at 20% once but then his hallcinuations surprised me and got me while my magicka was regenerating... heck I even dropped the Standard of Might, which is still a tad OP and it like maybe left a dent in the guy. I like challenges but wow, screw this.. just gonna move onto another quest lol.

I bet nobody has done this fight more times than me.

I kept coming back to him every few levels, but the outcome was always the same.

Finally, as a Level 29 Dragonknight, I returned. I tried kiting with my destruction staff, but I kept getting tripped up on things, and his summoned creature would take me down from behind.

After losing at Level 29, I was mad. So I threw all strategy out the window. I switched to sword, ignored the other creature, and just wailed on the Alchemist with everything I had at close range: mostly Stonefist and Silver Bolts, along with ample sword slashes when Magicka ran low. I decided that I might go down, but the Alchemist was coming with me.

I finally finished him and then turned around and took care of the shadow creature, whom I'd been ignoring, to that point.

I never walked out of a dungeon feeling so good.

This type of NPC and fight serves no purpose other than frustrate players, and causes people to give up on characters or the game itself.

I'm VR3 templar and put the quest aside for now after loosing more than ten times with various weapon/skill combinations. The recently introduced "automatic dungeon boss difficuly adjustment system" only seem to work on the main quest bosses.