Damn,i'm stuck,some deads appear,I know Isair and Madae isn't casting them,Isair attacks me and Madae casts her nifty spells than stuns non-evils,is there a bug?

A bug in regards to what? Everything you describe sounds normal.

Without giving anything away, try running--even scattering--your party as soon as you can. You see a high level priest about to utter a blasphemous word, one so horrible it stuns you or worse.

I think you should run away with your fingers in your ears. They are probably focused on the person they were dialoguing with--perhaps they should run one direction, the rest of the group the other?

Hm some mage was summonning creatures,i killed it and began Heart of Fury only to see goblins more powerful than Isair and Madae in normal mode,they are hitting with arrows to my AC 30+ monk,wtf is that???

That is Heart Of Fury mode, where everything is much, much harder. Monsters have way more hit points, hit a lot harder, and there are more of them.
HOF isn't just another run through the game with a more powerful party fighting monsters of the same strengths you met the first time.

The mage, Buvai de Naly, who teleported your party to throne room is now to your right behind the wall. Kill him immediately or he will non-stop summon undead, demon, elemental or powerful monsters.