Tips on final battle (spoilers)

[Vedran]

I found the first part, when first teleported into Isair and Madae's room, not a problem at all. I first kill off the summoner mage, then all the twins' lackeys and then I start killing Isair (because I can't do much dmg to Madae). After some time they run away. And that's where I'm stuck. I can't do anything to them in the fountain chamber. Isair turns invisible and Madae casts something that stuns all my characters for enough time to kill at least 2-3 members of my party.

I tainted the fountain and also helped the monk so they fight with me (not that they're very useful, though). So if anyone can give me a few good advices to how to finish the second part of the final battle, I'd be most grateful.

[JrKASperov]

Isn't there some stunprotection?

[Bozos of Bones]

No save and no resistance is applied against Blasphemy, the evil version of Holy Word. It stuns you for a round, and there's nothing you can do about it. But if she can do it so can you. There's also a tactic where you put Elemental Barriers on all characters and some in with raging Firestorms, Meteor Swarms and Delayed Blast Fireballs. I once had a full-spellcaster party and that worked perfectly.
Holy Word is a instantly cast spell, excellent because while everything around you stands still you may freely cast Mass Heal and the rest of the characters pound away. IMHO Holy Word is a 7th level spell, Mass Heal is 8th, and it wouldn't be a bad idea to max out on those. Have your Cleric freeze time while your Paladin or other spellcaster Dispell Isair. The Paladin's dispell is free if he has the Holy Aavenger, but the Wizard's Dispell has more chance of success.

[Bozos of Bones]

Actually, I just noticed that spell resistnace applies to Blasphemy, because my drow paladin hacked away at Isair while the earth stood still.
*goes out to create a party of svirfneblin paladins and drow monks..*

[Nightowl2]

Thing is, you don't need to do much fighting in the pool room. First, if you tainted the pool, the twins should be low on power. Isair mentions that when you arrive. I never had him turn invisible on me, that's strange.

However, after a couple of rounds, the mage (whose name I forget) from the tower you reach by making the pentagram should portal in and initiate the end of the game. You didn't kill this guy by any chance, did you?

Nightowl2

[Bozos of Bones]

If you kill him the game says load or exit as you've killed a plot-important person. The mage appears assoon as one of the twins becomes almost dead.