i'm in baator at the moment, there loads of demon-type things to kill. i havnt had too much trouble with them individually, but there's so many that i can't kill them all without healing my party - is there any way to rest, or pay for healing, in baator?
You could try to switch to tactics which avoid getting hurt, like the hide-backstab-flee around the corner-hide again tactic or make sure only TNO is hurt since he can regenerate.
Just hiding in shadows and sneeking past unwanted encounters might also help.