There is no way to beat Irenicus with this mod.
The fight now has two parts.
First part:
You have Irenicus:
- Self-casts protection from magical weapons, some spell protections, and whenever you try to dispell it from him, he instantly dimension-doors away. He then comes back and casts spells that do not exist in BG2, such as an artillery of Flame Arrows (it's a spam of 10 arrows that happens within one second). He will harass you with other things too, like Fingers of Death, and he will dispell you.
- A Black Dragon that will drain levels. Easy to deal with by casting protection from negative energy and dispelling his "Protection from Magical Weapons".
- Sarevok. He's undispellable, can't be targeted with spells, will sometimes be immune to everything.
- A flying Sword. It's immune to everything except magic missiles. But if you magic missile it, it will chase your mage (it's under constant improved haste) and kill the mage, even if your mage has Magic Weapons protection (immune to +5)!.. How?
- An elder Beholder. Easy to deal with.
So by chain-casting time stops and depleting all my resources, I was actually able to beat these guys.
Part 2:
And then a cutscene plays and Irenicus says "you didn't think this was going to be that easy?" and a new fight starts. We got:
- Some 4 Glabrezu-type demons with protections all over themselves. At this point I couldn't bother, I just CTRL+Y'ed them all.
- Irenicus turns into Slayer, stops time and starts hitting you for 60 hp per hit with 6 or 7 attacks per round. He's got so many layers of protection that he can't be killed with CTRL+Y, believe it or not. I'm not kidding.
Just for fun, I decided to play this again. I pushed through phase 1 with CTLR+Y and came in fresh for phase 2. I immediately killed all demons with CTRL+Y and so it was just my party against Slayer.
1- He can't be dispelled, I tried it all. The only way to dispell him is to CTRL+R him.
2- He's unbeatable even with a rested party.
How's he supposed to be beaten as a PHASE 2?
No. My only conclusion is that this mod is supposed to TROLL you. Someone slipped some extra lines of code somewhere during its 20+ years of development and now nobody can figure out that it's a prank.
The fight now has two parts.
First part:
You have Irenicus:
- Self-casts protection from magical weapons, some spell protections, and whenever you try to dispell it from him, he instantly dimension-doors away. He then comes back and casts spells that do not exist in BG2, such as an artillery of Flame Arrows (it's a spam of 10 arrows that happens within one second). He will harass you with other things too, like Fingers of Death, and he will dispell you.
- A Black Dragon that will drain levels. Easy to deal with by casting protection from negative energy and dispelling his "Protection from Magical Weapons".
- Sarevok. He's undispellable, can't be targeted with spells, will sometimes be immune to everything.
- A flying Sword. It's immune to everything except magic missiles. But if you magic missile it, it will chase your mage (it's under constant improved haste) and kill the mage, even if your mage has Magic Weapons protection (immune to +5)!.. How?
- An elder Beholder. Easy to deal with.
So by chain-casting time stops and depleting all my resources, I was actually able to beat these guys.
Part 2:
And then a cutscene plays and Irenicus says "you didn't think this was going to be that easy?" and a new fight starts. We got:
- Some 4 Glabrezu-type demons with protections all over themselves. At this point I couldn't bother, I just CTRL+Y'ed them all.
- Irenicus turns into Slayer, stops time and starts hitting you for 60 hp per hit with 6 or 7 attacks per round. He's got so many layers of protection that he can't be killed with CTRL+Y, believe it or not. I'm not kidding.
Just for fun, I decided to play this again. I pushed through phase 1 with CTLR+Y and came in fresh for phase 2. I immediately killed all demons with CTRL+Y and so it was just my party against Slayer.
1- He can't be dispelled, I tried it all. The only way to dispell him is to CTRL+R him.
2- He's unbeatable even with a rested party.
How's he supposed to be beaten as a PHASE 2?
No. My only conclusion is that this mod is supposed to TROLL you. Someone slipped some extra lines of code somewhere during its 20+ years of development and now nobody can figure out that it's a prank.