PArty= vagrant, jaheira, valygar, anomen, nalia, imoen, done all quests possible in chap 6 (apart orcus fight) plus 4 WK levels (still great wyrm and horde to complete on 5th floor), best weapons: hammer of thor, foa +4, root of the problem and staf of the ram (alas could not forge any of the two precious halberds due to missing components)
to make it short, on my first attempt I managed to kill every foe in twisted rune apart from layenne, and:
Vagrant (who was hidden from layenne los at the time) came in sight of layenne, she started to cast dispel magic, I retreated in the entrance so that other party members would not be touched, then her doudle timestop + alacrity fired while I was out of her sight, and she did nothing during timestop.
Afterwards, fight was a bit nasty (new summons, which kind I don't spoil), loads of spells but in the end she fell. Big self pride to win in my first attempt .
I retried the battle taking her blows on the chin (that is to say vagrant staying in her los), but whatever buffs, potions,... I took, she just obliterates my character at the end of double timestop.
Retried 6 times for same results

Hehe .

I wonder how you managed to escape Layene's LOS after she saw you and started her wish combo. You were apparently very quick and lucky. I refrain from expressing any opinion about whether the way you won the battle has been cheesy or not, but I'll certainly add refinements and scripts to that battle to make sure that no player will be able to repeat it again in that way in the next version.

Have fun!

I tried a few times but failed to reproduce the situation you described. I can't escape Leyene's LOS once she starts her wish combo, because the time is already halted and I can't move. And she doesn't start the wish combo if she is not seeing my protagonist at the moment (contrary to what you seem to have reported in your initial post). Can you reproduce it yourself or was it just a rare event out of sheer chance?

Can you possibly test this, Raven? I'm confused especially with that part of nicoper's report in which he said that Layene started the wish combo while she was not seeing the protagonist. It looks quite impossible to me.

keep hiden from layenne, move vagrant in main room, as soon as you see layenne fire shield completly go back and my "scenario" happen
trick looks to be to spend just the minimum but sufficient amount of time in her los

Equip your protagonist with as many items which grant undispellable resistances (and HP bonus) as possible (Red Coral Armor, Dragon Lord halberd, etc...). You may consider to postpone the battle to when you have decent equipment.