Eager Blade

Weapon (longsword), legendary (requires attunement)

This polished +2 longsword grants you an additional action after a successful attack, once per turn. You must use this extra action to attack an enemy with the Eager Blade or, if no enemy is within reach, to attack an ally or bystander. If no other target is available, you are instead incapacitated until the end of your next turn, as you attempt to bring the weapon under control.