Just ended my first game, it was awesome.
below my endinds and the one i picked for Karlach

In my walkthrough, Wyll became the blade of avernus, but was free of Mizora,
My Tav turned into a mindflayer to ovoid Orpheus to turn into one, I did not wanted him to sacrifice himself, being with Lae'Zel in my party
After that, when Karlach was burning I had few options :
- Letting her die
- let Wyll go with her in Avernus
- Refusing to let Wyll sacrifice himself and Go with her as an illithid in Avernus (witch lead in to some badass new quest in avernus with her and fixed the problem of being a mind flayer let lose in the human world), i choosed this one
- Going to Averus with her AND Wyll