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Take heed to discern between mindless monsters and brainlessness, a state attainable by unfortunate players not keeping their distance from mindflayers.
Mindless monsters cannot be detected by telepathy. They are also unaffected by the brain-eating attacks of (master) mind flayers. This protection does not extend to players polymorphed into normally mindless forms - "no such thing as mindless players".
List of mindless monsters
- Spheres (including gas spores but not floating eyes)
- Elementals (excluding stalkers)