Brooch of the Elements

Source: Netheril's Fall

Wondrous Item, Rare (Requires Attunement)

The central jewel of this butterfly-shaped brooch swirls with multicolored iridescence.

The brooch has 3 charges and regains all expended charges daily at dawn. As a Reaction when a creature you can see within 60 feet of you hits a target with an attack roll and deals damage, you can expend 1 charge and change one damage type the attack deals to one of the following damage types: Acid, Cold, Fire, Lightning, Poison, or Thunder.