Since I had to rush through to the Warden, yeah, my equipment is really, really poor. Just terrible. So if you had equipment helping you in any way, I have none of that. In fact, even the equipment that does drop for me that’s decent requires me to be level 16.
So, if you have them in your stash, use a bunch of those buffing potions and oils. There are some really good ones for low-end DPS (there is a bleeding one that gives a chance for a significant bleed).
Pretty much any class you kite with is what you want so it doesn’t need to be a demolitionist, it just made it easier with his defense lowered with flashbang and burned to death. I just took a look at his stats and it looks like his lowest resistance is poison. So maybe an Occultist (which also has max health reduction and a bleed dot) would give you a higher DPS.
So, I’ve been really addicted to this lately playing it on the Xbox. Early on, with all the undead, the post-apocalyptic setting, and different factions, (and going with dual pistols) I kept getting Walking Dead vibes. And now I gotta kill a Neegan-like (Cronley) who’s gone power-mad and whose own people are trying to cut ties with him.
The Telltale Walking Dead games were great, but it would have been awesome to have the dialogue/character interaction of that game with ARPG gameplay mechanics of Grim Dawn. Hell, I would take a turnbased Divinity: OS type game. Where are the zombie apocalypse RPGs?

I feel like I can retire from gaming now.
Seriously though, this fight SSSSUUUUUUUCKED. Level 86 my ass. This was a pure hit point sponge slog.
Congrats! That boss is a giant pain in the ass.