The ERS Daimajin was the first Star Destroyer in the Earth Republic Star Navy. It was launched in 2124 and commanded by Captain Hamilton Barca. In 2135, with Captain Barca at the helm, the ship went missing in hyperspace during an apparently normal jump between Epsilon Eridani and Omicron Eridani. The ship is considered missing in action, and there has been no trace of it since.
Between 2124 and 2135, the ERS Daimajin was the flagship of the Star Navy, and was succeeded in that role by the ERS Valkyrie. Many of the elder admirals, captains, and other leadership of the Star Navy, have at one time served on the Daimajin, including Nell Dorian (CO, ERS Fenris), Arden Grey (CO, ERS Iliad), Mykael Novak (former CO, ERS Gorgon), Nyx Vantage (former CO, ERS Valkyrie), and Søren Kuromoto (former CO, ERS Hydra).