This is a spin-off of the No-reload challenge. I suggest that we share our Black pits no-reload attempts in a common thread.
Similar rules apply:
1) Black pits 1 and / or Black pits 2.
2) No-reload. If your party dies, you're back to square one. Of course, if your computer crashes, you can reload your last save. Also, you can restart with a save from before the first fight of tier 1, if you want to skip the intro cutscenes.
3) Sword coast strategems recommended, particularly in BP1.
Thing is, Black pits 1 is super easy. I've taken a trio comprising barbarian, zerker, and d. defender through BP1, and really had no trouble at all. Hence, either use SCS, or take a duo / trio, or nerf your classes / stats. Roll your own challenge modifier.
Please specify BP1 or BP2, mods installed, your characters, stats, and classes.
I'm planning to take a full group through BP1, then either import them into BP2, or roll them up from scratch. I chose the relatively easier SCS spellcasting settings, namely Option 3: Mages never cast spells instantly. They're probably still pretty nasty.