Index entry
Thinker's Bandana
Once per turn, you may use your Intelligence modifier instead of Strength or Dexterity for a melee weapon attack roll and its damage roll. This applies to any melee weapon attack, magical or non-magical.
Complete rules
Calculated Strike Once per turn, you may use your Intelligence modifier instead of Strength or Dexterity for a melee weapon attack roll and its damage roll. This applies to any melee weapon attack, magical or non-magical. No action is required to activate this feature.