The Only War was a war fought between The Imperium and the High Empire - Multiverse-spanning empires with enough power to cause mutual destruction and probably the destruction of the Multiverse with them. Ameryl Hypericum and the Highemperor agreed to a peace treaty that would make this the only war between their domains and the two entered a cold war state. The two empires since have had both hot and cold relations as they both help and hinder each other as the mood fits.
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Under the threat of mutual destruction and the destruction of the Multiverse, the two sides agreed to halt hostilities and enter a cold war state. Since then The Imperium has been known to help the High Empire[Tales 1] and also do minor battle with them[Tales 2].