Amulet of Equilibrium

This spiraling pendant is made of three magic-sensitive panes of colored crystal, with each piece being attuned to a different arcane element. If you cast spells, you can use the amulet as a spell-casting focus while you're attuned to it.

The amulet has 4 charges and regains 2 expended charges each day at dawn. Whenever you would deal cold, fire, or lightning damage to a creature with an effect that targets only that creature, you can expend any number of charges to re-roll that many of the effects damaging dice.

Whenever you take cold, fire, or lightning damage from a hostile source, you regain 1 charge.

Notes: Necklace, Focus