Erebus

Erebus was an Interstellar Coalition colony settled just after the Xindi Conflict. The original colonists were predominately Human.

During the Guardian Conflict of 2157, the planet was among 27 Coalition frontier worlds that suffered a biological weapon attack by the rogue Cylon group, the Guardians, via their flagship squadron, the Crimson Elite.

The planet suffered heavy causalities and had to be evacuated for over a year until such time as the viral infection could subside and colonists could return. Following the conflict, the planets attacked by the Guardians became known as The 27 Dead.

Triva

 * Erebus was one of the names for the Greek Underworld, where the dead had to pass immediately after dying.