Starlight Blade: Ceruleus

+3 Greatsword, 2d6 Slashing, reach, heavy
{w} This weapon has 4 charges, regaining all its expended charges at your next short rest. As an action, you can expend two charges to release a massive wave of abyssal starlight. Make a melee attack against a creature within 20 feet. On a hit, deal force damage equal to the damage this weapon would normally do.
At last you have found it. Your true mentor. Your guiding starlight. May you never lose your way again.