Ring of Gyges

Ring, very rare

This old ring always looks battle damaged after centuries of use, and holds 1 charge which is replenished daily at dawn. As an action you may expend a charge to grant yourself an aura of limited invisibility, which lasts for 10 minutes. Alternatively as an action you can expend a charge to launch a bolt of lightning to hit any target within 60 feet, dealing it 1d20 points of lightning damage (Constitution save DC 15 for half damage)

Limited Invisibility: Attack rolls against you have Disadvantage. This does not grant you Advantage to your attacks.