Sling of Shapechangers

Weapon Uncommon (this item requires attunement)

A leather sling that has a place for bullets, but when swung and released shoots magical +2 bullets. In normal use and opertaion, this sling is a +2 sling that deals force damage and does not require ammuntion. When within 120ft of creature that can magically change their shape without the use of the polymorph spell, the sling begins to vibrate and shed a dim red light. If the sling is used against said creature, the damage increases to 1d12.