[Spoilers] The final battle, A little too hard for me :( Options

[Anomaly]

Hello,

I have successfully beaten the tatooed man at the Friendly Arm and his little army of wind horrors and undeads... one by one, thanks to this nearly-invincible Flamming Fist Elite's unit with great thac0 and unlimited cure critical wounds spells... although he failed once his morale check, and I was in big trouble Wind horror in particular have such a great Thac0, I doubt it is possible to kill them without using the guard as a meat shield.

I have also beaten the high sorceress on the top of Friendly Arm Inn without too much pain... thanks to my wands.

I am now in Beregost, teleported into that large room. I awake in a corner, far from Teven and the two high sorceress. A Big Thanks for that, it allows me to save right after the cutscene and before the battle (it's bloody annoying when you have to watch a cut-scene or choosing dialogues options before a battle at each reload).

But I cannot kill any of them. I can even hardly hurt them before I bite the dust.

Teven have lots of hit points and a extremly good Thac0 : even with ctrl-y the two sorceresses I can't kill him without loosing most of my party. And with the sorceress and their mass dominate spell, I am really helpless. I do not forget their globe of invulnerability (my dispel magic failed to dispel those), which made them immune to most of my magic. My wands did nothing either.

I have tried to drink two potions of magic resistance to get 100% immunity to magic, but with the sorceress's ability to teleport away and attack my group, this is not a winner strategy. I am thinking to either a) drinking my all 10 potions of magic resistance and using one protection from magic scroll to get all my party immune to magic, or ctrl-y three times

Any hint for this battle would be very welcomed.

PS: I am playing the Bg1Tutu version.

[underdog]

It took me several tries (10+) with most battles lasting ~5 minutes, with 4:50 at paused to select things to do the victory probably was cheap and wasn't pretty but it worked.
But my Bounty Hunter Imoen with her 'special' traps made quick work of the sorceress',
laid a nice field of traps in the route that they usually took when approaching the party, then tossed a special trap, (they can be thrown) down at them it went off they started walking toward me setting off more traps as they went and hitting Teven at the same time, he was badly injured by the time he reached the party, then just engage him with melee MMM and MM's from Indra and Dynaheir.