The Xyntas-class Cruiser was a special warship of the Lost Ones navy. Only one known vessel of this type, the Acheron, was thought to have been built. The vessel was used to strike fear into the hearts of the Lost Ones' enemies. The largest ship in the Lost Ones' navy, the ship harassed larger shipping lines, but was mainly used as a symbol of fear. This was until the Lost Ones came into conflict with the Muir. They needed the vessel to effectively fight against the much larger Muir navy. Over time, it racked up an impressive number of kills against the Muir, until it was eventually bested and destroyed.