Ring of the Sun-Walker
From D&D Wiki
Ring, rare (requires attunement)
To anyone that looks upon this ring, it looks like a normal iron band with a blood-red ruby adorning it. This ring can be worn by anyone, not giving any seeming bonus. However, when it is worn by a vampire or a character with sunlight sensitivity, they no longer take damage from sunlight and no longer have disadvantage on attack rolls and ability checks made in sunlight.