[Not an Issue] Mind Flayers

Zathras

I tried doing the Mind Flayer dungeon, all my characters had chaotic commands and negative plane protection but the flayers' psionic blasts and intelligence drain worked anyway, killing my character (who was wearing amulet of power).

Smilge

The mind flayer's intelligence drain cannot be prevented negative plane protection; negative plane protection only works against level drain, either the level 9 spell or a vampire's attack. The only spells that would prevent the mind flayer's intelligence drain would be something that denies the attack entirely, like improved mantle or protection from magical weapons (but not stoneskin or mirror image). Personally, I use ranged weapons and summons to tank.

Psionic blast should be preventable by chaotic commands, though. Can you verify that a character with chaotic commands active was stunned by a psionic blast?

Zathras

Hmmm, after quick loading, the psionic blast problem went away and I cleared the place with relative ease, just had to gulp some potions to raise intelligence.