Rebirth of Light
Chess game of Fate
If successful against the game the player receives a bonus to sliding, and shifting powers. Failure equals negative to those. Though I might change the official bonus or curse.
The immortal game is a renowned artifact that takes the shape of a chessboard. Once the game starts it must be played until completion or risk suffering a curse. The player who initiated the game must continue to play once per night, making a skill check. The player may avoid playing the game for up to three days but then starts to suffer from inability to sleep. It is said those that beat the game are gifted with a boon while those that fail suffer a curse.