Mind Blade

Generic Variant, rare (requires attunement by a specific individual)

Mind flayers can turn any nonmagical sword into a mind blade. Only one creature can attune to it: either a specific mind flayer or one of its thralls. In the hands of any other creature, the mind blade functions as a normal sword of its kind. In the hands of its intended wielder, the mind blade is a magic weapon that deals an extra 2d6 psychic damage to any target it hits.

Variants:

Mind Blade Longsword

  • Damage:
    • One-handed: 1d8 S
    • Two-handed: 1d10 S
  • Weight: 3.0 lbs.

Mind Blade Double-Bladed Scimitar

  • Damage: 2d4 S
  • Weight: 6.0 lbs.

Mind Blade Greatsword

  • Damage: 2d6 S
  • Weight: 6.0 lbs.

Mind Blade Rapier

  • Damage: 1d8 P
  • Weight: 2.0 lbs.

Mind Blade Shortsword

  • Damage: 1d6 P
  • Weight: 2.0 lbs.

Mind Blade Scimitar

  • Damage: 1d6 S
  • Weight: 3.0 lbs.

Source: Volo’s Guide to Monsters p. 81