Ring of the Lantern

Ring, Rare (Requires Attunement)
These rarely seen rings are masterfully carved from bioluminescent wood with intricate patterns reflecting the fungal infestation of the source tree. They glow with a gentle light which does not provide enough illumination to see but does seem to shine even in pitch darkness.
While wearing this ring, you gain Darkvision out to a distance of 60 feet. If you already possess Darkvision, its range is increased by 30 feet.
In addition, you can cast the Blindness/Deafness spell from this ring once without expending a spell slot. Intelligence, Wisdom, or Charisma (your choice) is your spellcasting ability and you regain this feature when you finish a Short or Long Rest.