Star Wars: The Horizon's Edge
A Cube about the size of a man's hand.
From a first glance it just appears to be a brass puzzle box. On each side of the cube are discs made from crystalline materials and circuits. It looks to be just a old puzzle box. However you feel the cube resonates with the force but it wont open. Holocron Puzzle Handout.
Jedi knight Kith Xarrex Had in his possession. He will give to his apprentice to insure that the Jedi legacy will be continue.