The Battle of Unbinding occured in 0 BU and was a pivotal moment in the history of Mythron. The location of the battle is currently unknown, however it is known that Rowan Richardson's father was killed in this battle, allowing Rowan to ascend to the throne. It is debated whether The King was killed by Rainosian soldiers or killed by assassins, sent by his son. After the battle, the majority of fighting between Mythron and Rainos ended and brought about an uneasy peace. Some skirmishes have taken place since then but very few major battles.
Ever since the battle, all dates in the LOM are measured with BU (Before Unbinding) and AU (After Unbinding).