I regularly get creamed by the illithid brain devour. You can't save against it and no spell or item protects from it. However, almost every time you face a group of illithid, it's in a room with a door. You can use this to your advantage - open the door, throw a cloudkill in with the appropriate wand, and close the door. Illithid have considerable trouble opening doors, so you can just sit back and let them slowly asphyxiate.
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