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.
When making an attack with a Finesse weapon, use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.
If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.