The first time you cast a Power on your turn, you may choose to also recover 1d6 energy shield points as part of that cast. If you do, you gain one stage of Unstable Power (to a max of 10) and must roll a d10. If the result is equal to or less than your stage of Unstable Power, you lose all stages of Unstable Power and must roll on the Chaos table. After losing all stages of Unstable Power, you can’t invoke this feat again until you complete a long rest.