Ring of Second Sight

Ring, very rare (requires attunement)

While wearing this ring you gain supernatural insight to your surroundings, even possessing slight glimpses into the future. As a free action, you can use the ring to gain advantage on a skill check up to three times per day. Once per day, as a bonus action you can activate the ring for one minute to become aware of any danger in combat.

While active, creatures cannot gain advantage on attack rolls against you.