It feels a bit odd that Solveig and Grettel can still get into the marches if the orc camp gets destroyed. How did they get here?
Can you not just target the healer to reduce the amount of healing they can get per turn?
wiki.smutosaur.us
You kinda can. There are two big issues though.
1. The healer has Healer's Hands and a ton of health (over 500), so she can sustain herself pretty well by healing the others. And her heal is
Great Heal, so she heals for a lot.
2. Amberoga herself has Tough Skin, Frostwarden, War Banner AND Berserkergang. Her damage actually isn't that high, but she's an absolute brick wall of defense that's hard to chew through if you didn't specifically plan for it. Even if Ishtun dies she can sustain herself really well.
(Also, 2.5: Amberoga generates a fuckton of threat, so your summons and companions if you aren't on Manual will always hard target her and not Ishtun, the healer).
Basically, the fight is hard, but because the enemies have a ton of sustain and not much damage, you don't actually
lose most of the time. You just sit there locked in a stalemate forever until you eventually get bored or someone gets lucky with their crits.