Advice needed against RR Aran and friends

[Kazilan]

My party has slaughtered its way through the guild and reached the door to Aran Linvail's sanctum. We down healing potions, cast True Sight (per the readme, thanks for that), and open the door and ... quickly need to reload. I have the Rogue Rebalancing mod installed (lots of fun) and I can't find a way to beat Aran and co. I managed to kill the leader once, but his cronies slashed my party to pieces in the process. Is there any place I can rest in the dungeon? My spells are mostly depleted. If not, does anyone have any recommendations? I have a wand of fear and Haer-dalis can use a harp that casts confusion (two charges), but I can only catch a couple of his guys. No greater malison, either. And they keep drinking healing potions! Now I know how the npc's feel. Any suggestions welcome. Poor Minsc, they always go after him first ... very sad.

My party: PC- fighter/mage multi; Minsc; Haer'dalis; Aerie; Amber (mod - fighter/thief dual).

[Kazilan]

Finally beat it after at least a dozen attempts on easy. Aerie died, but not until she spammed with the wand of fear to send the assassins running in circles. Wand of life fixed her up. My PC also had to wear the boots of speed and run in circles for a while, but all that matters is surviving.