Kruin and Inquisitors, questions Options

[Kerkes]

well, I must say I'm a bit surprised nobody asks help about this one.. (in my latest run, it was the hardest battle for sure. 17 reloads! AAAAAArrrrggh!)
The thing I wanted to ask is this:
Is Kruin immune to "dispel magic" cast from an Inquisitor?
I once played the game with a custom Inq in party (was lvl 18 by the time I met Kruin, I did some of WK, Umar Witch etc.before going back to Alkathla from Underdark). As soon as his buffs kick in, Inq fires his dispel. I get a message : spell ineffective?!
Now, I quit inquisitors for good, and took a blade instead, which, I must say, are 10 times more useful than an Inquisitor will ever be (if you want a powerful dispeller, that is) regardless of his Avenger sword.
Same battle, blade is lvl 23.
Took 4 reloads, and it worked ("remove magic" was succesful.)
What's up with that?

[Sikret]

well, I must say I'm a bit surprised nobody asks help about this one.. (in my latest run, it was the hardest battle for sure. 17 reloads! AAAAAArrrrggh!)
The thing I wanted to ask is this:
Is Kruin immune to "dispel magic" cast from an Inquisitor?

No.

I once played the game with a custom Inq in party (was lvl 18 by the time I met Kruin, I did some of WK, Umar Witch etc.before going back to Alkathla from Underdark). As soon as his buffs kick in, Inq fires his dispel. I get a message : spell ineffective?!

In the vanilla game, all dispel magic/remove magic spells had a bug with one of their effects. Not the main dispelling effect, but the one which was showing the dispelling visual animation was bugged and could be stopped by (Minor) Globe of Invulnerability. As I said, the main dispelling effect didn't have this bug.

In IA, I have fixed this bug, for all such spells, so that you should never see the "Spell Ineffective" message as you would see in the vanilla game. They are fixed even in v5, but perhaps, this paricular fix was not implemented for Inquisitor's dispel magic in v5 (I don't remember). I just checked the v6 version of the spell and it doesn't have the bug, which means it is surely fixed in v6.

However, as I said, that vanilla bug only existed for the visual effects not for the main dispelling effect. The reason your 18th level inquisitor's dispel magic has not worked against Kruin is because inquisitor's dispel magic spell is nerfed in IA and while it works at a higher level than the inquisitor's true level it is not as powerful as it was in the vanilla game (it doesn't work at the double level). Kruin is high level enough to have a chance to stand the dispelling effects of an 18th level inquisitor.