Don't be surprised... I'm a special education teacher, I hold a Master's degree, I'm an amateur voice actor/writer/audio play producer... and I'm a brony. ;-)
Eternity is something that can never be reached. Even Equestria's princesses won't live forever. The end, however, comes much sooner than anypony expected.
While Star Bolt tries to forget his life of sin. An ancient evil sits and waits for the day that its prison will weaken so it can break free and finish its goal that was started 2000 years ago. The extinction of the alicorn race.