Just a suggestion to change the glooms that grant immunity to mind spells.
I say this because I love playing a color spray wizard and when I prepare color sprays for a quest that it normally works for, then I go frownie face when they all say "no I'm immune"
Afaik it's the wine and the chaos/slaad gloom that do this?
Maybe just a + to their saves would be OK, that way at least the color sprays prepared (or for other wizards, etc.) won't have been 100% wasted. I dunno, anyone got better ideas..? :(