Overall difficulty for this part: you can die, but it's pretty quick and tactics are straightforward, all things considered the Emissary Alpha fight is difficult to top in overall bullshitness.
Okay so I kind of underestimated the damage you can take if you're not completely aware of what's happening here. Fortunately I had Dagna prepare a special something during my attempts on the Ogres earlier, a special suit of power armor. Dwarf-only, of course, because I'm a roleplayer. It's a 10% Masterwork Dragon Bone & Veil Quartz Legion of the Dead armor suit. It comes with a ton of armor and a ton of health. The additional health increases the total guard amount, and the 30 additional armor on it reduces the Bolter damage to "tickling" instead of "lethal".
It made the remaining of the game very easy, with only one dangerous target: Earthshakers and their poison bullshit, and even then, the added health proved to be a very good choice. 10/10 would recommend crafting.
The most hilarious fight was the last pull. Two Earthshakers, Two Bolters, Two Revered Defenders, Two Shades and Two Cretahls! Woah! I wonder if I can teach them a new trick with this ladder? I shall dub it "The Cadash Diving Board"
The end boss is essentially an Ogre Alpha, except it has slightly more health but deals its damage in one swift go. So the same tactic applies here, leading to a long, long fight. The tentacles deal either four times ~500 damage every 2 seconds, with a random (about 10%) chance to deal four times ~750 damage. Maybe the numbers are off, but that's the gist of it. If you're a tank, you have a random chance to be instagibbed every 2 seconds, unless you have an armor buff or you're a Champion or something, and otherwise you take like 4 damage.
It took me two or three attempts to really understand what was killing me, but once I noticed the random tentacle burst bullshit on video, I immediately knew what to do. I sometimes wonder why this game doesn't have a combat log.
So basically, the strategy is as follow: equip your crazy tanky masterwork Legion of the Dead Armor/Health, equip a x5 Hidden Blades and a x4 Hidden Blades (Walking Fortress is useless here), get all the crit chance you can find to lower your cooldowns, ignore the tentacles and go straight for one of the crystals, War Cry, attack for 5 seconds, War Horn, attack for 5 seconds, war cry, warhorn... combat roll out, avoid the lightning, charge back and immediately war cry, attack a bit, war horn, attack a bit, etc. It's easy to execute, but long (about 15 minutes). I was very conservative here though, as I didn't want my stamina to deplete.
I'm happy to have figured out *how* to defeat the entire game solo on nightmare with an unspecialized warrior, but I really need to find 2-3 more hours, some coffee and some redbull to defeat the Emissary Alpha once and for all and say I really did it all. Damn you, reverse bullet time bullshit bug.
I have so much boring raw footage though, I kind of want to sort and edit through all of that and turn it into a mildly entertaining/informative video!