The Guru's Staff Piece

"The Guru's staff appears to have broken, but this is the most important piece since it still holds his powerful Moon Stone! Maybe one day you can help him repair the staff, but, for now, all damage to the player is reduced by 50%!"

- In-game description

The Guru's Staff Piece is the Treasure reward from the Safe in 40 Thieves in Sly Cooper: Thieves in Time.

After collecting the Guru's Staff Piece, whatever character the player controls will take only half damage.

Trivia

 * The item's description implies that the Cooper Gang will meet The Guru again in the future.
 * How or when the Guru's staff was damaged is unknown.