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Excalibur is one of the last remaining aerial battleships of Shevat.
Originally called the Prayerstar – Reconnaisance Vessel, the Excalibur was one of the vessels that was being housed within the Eldridge when it fell to the planet.
It was later excavated by Shevat during the Shevat-Solaris War 500 years prior to the events of Xenogears along with an identical sister ship—the one piloted by Sophia during her final suicide run. Its weaponry is on par with that of the Gebler warships.
The Excalibur was used in conjunction with the Yggdrasil IV in order to disable Merkava's main cannon. It has a massive, detachable ram on the bow.