Sometimes you can poison the drinking skull in the roasting dwarf area that cuts down a few of the entrance area, you can take down spike and his guard without aggroing everything and break as many drums as you can on the way. I normally do spike release volo, kill gut, release helsin, then the drow and then dror raglin. the turn based thing takes forever as npc's decide what their next move is. and High ground is a massive help.
