war-bird

Giant birds that serve as the Celestial Knights' flying mounts. They are summoned by blowing into a conch and only attack evil.

Despite being centuries old Dekkion  can still summon his saddled war-bird that arrives promptly. Discounting these creatures being magical conjurations this suggests that they have life spans of many centuries and never abandon their owners, regardless of how much time has elapsed or whether the rider has fallen from grace.