not sure if anything i can tell would be any help
but
i managed him 1st try on my barb solo with lvl 57, just closely after game start
nothing to fancy with gear set up
and i think i was actually very lucky thinking of it after
but y key to success is saving your skills for right moment and use globes only if necessary
or when you have abundance of it on playfield
imo hard part was at u25% when he summons mirror illusion as well as shadows and you need to down those or die at it
not sure how it can played with dh but i guess (have that char on 34) its doable ofc its end boss so dificulty is i think expected to be harder than all other game content - at least solo / story mode
so i advice you to save burst / aoe skills on shadows / clones and with dh auto attack and moving in same manner you can be patient and down him enough this way
gl

That stupid Worm boss in the previous dungeon was even harder for me :/

But yeah I also wiped once on Skarn.

For anyone interested I finally beat him at paragon 6 really easily.

nice linear power spike for this game LLOL

D3m in a nutshell lmao

Idk I solo'd the entire story line up until I'm paragon 38. If anything, everything was insanely easy. Way too easy honestly. Didnt spend a dime and I've put about $10 in the game and got nothing to make a difference. (Completed the story line before I bought a little bit of the bundle packs, and once again, it literally gave me nothing extra other than maybe 2 upgrades on my basic gems and a 2 star Legendary Gem which only summons a shadow on % chance.