Radiance

A +1 Wand of the War Mage
While you are holding this wand, you gain a +1 bonus to spell attack rolls. In addition, you ignore half cover when making a spell attack.
A creature that is attuned to Radiance can use a bonus action while holding the mirror to cast the enhance ability spell, chosing itself and no other creature as the spell's target. Once this property of the wand is used, it can't be used again until the next dawn. The wand is Sylvarie's, but she offers it to the characters as a reward for ending her curse.