Immortal Eyes

The Immortal Eyes or Eyestones are four gemstones created by a curse of the Selkie Queen Merala during the Shattering.

Creation
According to the story, as the last fae were attempted to escape to Arcadia through Silver's Gate, two sidhe brothers blocked the way. The brothers, one Seelie and one Unseelie, could not agree on which of them should have the honor of going into Arcadia first, and they refused to let anyone else pass until they resolved their squabble. The closing of the trod (with the brothers still locked in a contest of wills before it) stranded a large number of commoners, including Queen Merala and her people.

Merala, outraged, imposed a curse on the brothers and Silver's Gate: the two sidhe turned to stone, and their eyes turned to gems and fell out of their heads. Silver's Gate, meanwhile, would not only remain closed, but no sidhe or anyone serving a sidhe would be able to find it unless Seelie and Unseelie worked together "with love in their hearts."

The four gemstones were hidden away among kiths friendly to the selkies.

Powers
All four of the Immortal Eyes are powerful reservoirs of Glamour. Any changeling who possesses one of the Eyes can double their temporary Glamour; possessing more of the stones further multiplies this.

In addition, each stone has its own unique powers: When used together, the Eyes are meant to allow the users to find and open Silver's Gate, cleanse them of Banality and enter Arcadia in their true (faerie) form.
 * The Keystone, or Eye of Opening can unlock any door, gateway or barrier. It appears as an emerald and was given to the nockers.
 * The Waystone can lead the user to any location they seek or any object they want to find. It appears as a sapphire and was given to the clurichaun.
 * The Changestone can alter the user's appearance and circumstances. It appears as a ruby and was given to the satyrs.
 * The Shadowstone can purify the user of Banality. It appears as a black opal and was given to the menehune.