User blog comment:Western Gen/Speculations for Season 13/@comment-175.145.193.98-20150312104824/@comment-66.87.70.190-20150315082747

Metastability grants an AI to behave like a human. They wouldn't be immortal unless they managed to keep their processors intact. The past AIs in the Halo universe managed to achieve metastability was because they had a goal to keep them focused. Epsilon being a fragment might not be as fortunate. Plus if anything Epsilon is already in metastability given how it chooses to go by church instead of Epsilon.