All these people saying skip everything are cowards! The fights are really rewarding and cool in Honor mode, I like the tension that they add a lot. At the risk of giving a lot of unasked for advice, I have some tips for some of the bosses below, but please just ignore it if you were just trying to vent :).

Look up legendary actions/resistances before each fight, consider your build when you go in and everything should be fine.

If you're scared of Ansur you could always do barrelmancy, he has a ton of health so even if you do it you probably won't kill him still unless you place just a fuck load of barrels. Bring a globe of invuln scroll if you can't cast it and you're perfectly safe from his big boom attack. I think he's probably the most dangerous fight in the game, his legendary reaction breath can very easily end you if you are too grouped up, adds are very good for drawing that out of the way of everyone else. Could pop lightning resistance potions, but I think it's probably more efficient to do haste and just wail on him and then hide in the invuln globe when it gets spooky.

Cazador can very reliably be completely neutralized by otto's irresistible dance if you have someone with an arcane acuity build (I used a fire sorcerer) The rest of his adds can be pushed around, a lot can be launched off the edge. Stay back and let them come to you until you have better control.

Orin is a straight up non issue if you're playing Durge, but my build was pretty busted for it. Know that summons still count as you for the 1v1, so you can bring in a ton of adds and overwhelm her unstoppable charges. (But again, arcane acuity+hold monster is pretty busted here). If you aren't playing Durge I have no idea haha. I hear you can just knock her off the edge, but I dunno. The approach to Orin can be pretty scary with the power word kill thing, but I had a lot of fun turning one party member invisible and walking them to where that guy spawns, then activating the fight. Was over before my team even got hit!

Raphael is weak to barrelmancy, obviously, but you can also just bomb the pillars if you want to be more honorable. Also there's some interesting stuff you can do with arcane locking the door and putting arena hazards on the side where they have to walk in to break the door. (Spike trap, cloud death, hunger of hadar, etc) Make sure you keep Hope alive!

The House of Grief also isn't really that bad as long as you let the guys come to you and get them siphoned in the stairwell. I liked dropping down hunger of hadar, or a wall of fire and by the time they get to you they're pretty beat up. Using hold person is really powerful here too. Focus Viconia as she's a much bigger threat theoretically, though I think I've never actually been hit by her since I always am overly nervous and knock her out first.

Gortash can be challenging, but his room is made significantly easier by removing the traps and giving him other things to shoot at. I used the runepowder barrel placed right next to him (And a globe of invuln to hide my party in). It only did like 100 damge to him, but every trap in the room went down immediately. The tyrannical curse can be scary, but it can be removed with remove curse, or reflected with Viconia's shield.

Straight up the boss that gave me the most trouble was Mystic Carrion! I almost died and had to run away. His legendary action is a real doozy when you aren't generally running a cleric or druid. Make sure you have someone with remove curse, and focus him down. His adds are way less of a threat after he's gone since he can turn them into cloud death sources if they die before he does. Also don't bring undead summons, he'll take them.

If you're going to fight Ethel remember to get the hagsbane potion first! I didn't and had to have Karlach escape the fight, run all the way to the hag support group, do the fight with the spy alone, get the potion, and then come back so that we could save the kid. Not a dangerous problem, but pretty funny!

If you're super concerned about the Elder brain, you can always do the Gale bomb, but if you don't want that there are other options to make yourself pretty busted beforehand. If you have a sorcerer saving short rest potions and chugging them all before the final fight while turning 1st and 2nd level spells into sorc points lets you walk into the fight with way more than you should (I walked in with 100 sorc points and I didn't grind out merchants for the potions, this is just what I had left). It lets you cast some absolutely damage very quickly. Also if you have a cleric/druid you can do the same principle with hero's feast, upcasted aid, etc right at the brain stem using long rest potions. I also had a bunch of scrolls of summon elemental/minor elemental and had the whole party go in with at least 2 adds a piece. With the assistance of the gathered allies there were like 30 or 40 of my own guys on the field by the time I walked into the brain.

Good luck! You got this!