Why the barbarian is best when fighting illithids

DM: okay barbarian roll for your Brain Dodge

Barbarian: IT'S INTRACRANIAL ATHLETICS!!

DM: whatever

Barbarian: just gotta develop the right muscles

Wizard: <snortle>

DM: we're all impressed with your physical dedication

Barbarian: EXTREME dedication

DM: yeah just roll your brains already

Rogue: his what dodge?

Thick skull: brain can block

Those illithids were scary in The Dark Elf Trilogy.