Eir's Truesight Eye

The character has one eye that sees in truesight, which they keep covered. Removing the cover allows the character to cast True Seeing, which only provides it's benefits at half the range it usually would.

This spell gives the character the ability to see things as they actually are. For the duration, the character has truesight, notices secret doors hidden by magic, and can see into the Ethereal Plane, all out to a range of 60 feet.