Please help me with Planar Sphere Quest

If you have someone with high magic resistance, like a Paladin with Carsomyr, buff them up good and have them lure in a few at a time. I summoned a few monsters to give them something else to target and put everyone else, except Aerie, using ranged weapons to disrupt their spells. I had to keep my paladin healed, but not a problem with Aerie in sanctuary. I got killed the first time too, but I didn't take them lightly the next time.

You could try the wonder spell, emotion. If all else fails, you've got three characters capable of backstabbing. Give Yoshi a few invisibility potions and take out that mage with stealth.

[WOLFGIR]

Hi there, this is a tough one. I got it to work out like his:
First lure the fighter "halfling" to you with arrows and badh em down, alot of arrows and some good fighting will let you do this pretty easy, try to stage your own thief in a position where he can backstab them, and a tip try to always buy potions of invisibillity, gives you thief the advantage of manouvering unseen for next backstab.

Now heal up and start with a sneak up on the mages, a perfect timing can lure them at you one at a time. Then in this fight, the others here did mostly what I did, cloudkill, summon insects, breach, dispel magic, and so on.. Use your thief to strike from behind! Valuble points when a breach spell or disell magic have loosened up thoose protective magics. Enraging Minsc with a +3 2H-sword is a good alternative. Yet, I lost one, Yoshimo, cause I neede him the least and have alot of resurection and so on.. Hey Yoshi! Fetch some magig punishment for me! He actually got one backstab!!