Hammersphere

Wondrous item, rare (requires attunement)

This 3-inch golden sphere is engraved with dozens of small hammer-shaped symbols. While holding the sphere, you can speak its command word as a bonus action, causing a floating, spectral hammer to appear within 60 feet of you.

When you summon the hammer, you can make a melee spell attack against a creature within 5 feet of the weapon. When you make the attack, you do so with an attack bonus of +5. On a hit, the target takes 3d8 + 5 force damage.

As a bonus action on your turn, you can move the hammer up to 20 feet and repeat the attack against a creature within 5 feet of it.

The hammer disappears after 1 minute and can’t be summoned again until the next dawn.