He and the other Prelates had trained long and hard in the Sacred Promissory. Deep in its halls within the rocky foundation of High Charity’s dome, they had learned the dangers of pushing their altered bodies too far: sudden, debilitating exhaustion, seizures, and, in rare cases, death.
	In short bursts, the Minster of Preparation had told the Prelates, you can defeat any foe. Even, the Minister had hoped, the humans’ demonic Spartan soldiers.

-Halo: Fractures, pg. 183 (Halo: Shadow of Intent)

	the Prelate knew he had just a few more bursts of hyperlethal speed before his body completely seized

-Halo: Fractures, pg. 186 (Halo: Shadow of Intent)