The Somber War was a military conflict involving most nations originating in the Commonwealth that lasted from 9 October 2017 to 8 April 2018.

The war drew in all the server's economic great powers, assembled in two opposing alliances: the Western Alliance versus Nox/Lexington. Although the initial alliance only consisted of Hjaltland, Mir, and the Commonwealth, the alliance was re-organised late in the war and expanded as more nations entered the war, such as Yoahtl, Southshire (then as part of Yoahtl), Gensokyo, Okashima, Vinland.

The trigger for the war was the declaration of war by Lexington on Hjaltland and the Commonwealth and the subsequent obsidian bombing of Westminster, the capital city of the Commonwealth. This set off a diplomatic crisis for a vast variety of nations on Civclassic, such as Tvtopia, who publicly stated their support in favor of the Commonwealth while others declared and/or kept their neutrality, such as Yoahtl (at first). These declarations of war were soon matched by a formal declaration of war on Lexington by the Commonwealth.

Quickly following the obsidian bombing of Westminster, Lexington City was captured and Lexington fighters retreated into their bunkers, the war turned into a battle of attrition, with a trench line that changed little until the end of the war.

Followed by a couple attempts at breaching the Lexington vault, during early April 2018 a new plan was formulated by the Western Alliance with the new powers that joined. After a two day siege the vault was broken, culminating in the end of the war. The end of the long, stalling war brought peace to former warring nations, the disbanding of the Western Alliance in favor of SATO and the end of Nox.

Read more on the "Somber War" Wiki article.