Elemental Control Ring (5e Equipment)
From D&D Wiki
Ring, rare (Requires attunement by a Druid or Spirit Guardian)
A brilliant rose gold ring with a diamond as the centerstone, filled with elemental energies
This ring has 3 charges and regains 1d3 charges daily at dawn
Elemental Dominance As an action and expending a charge, you can cast dominate monster (Save DC 19) on an Elemental within range
Elemental Resistance At the end of a long rest, you may choose one Elemental Plane. You have +2 AC against all attacks from Elementals originating from that plane, and you gain resistance from one damage type corresponding to that plane.