The HMS Orion, as the lead ship of her class of 4 was laid down in November 1909. Launched in August 1910 and commissioned in January 1912, she and her class would feature the new 13.5-inch gun. This along with their thicker armour would lead to them being colloquially referred to as "super-dreadnoughts". Despite this and despite being active for the entirety of the First World War, she would see relatively little combat. Seeing action in the infamous Battle of Jutland and the Action of the 19th of August, the vast majority of her career during the war was simply routine patrols and training. Following the end of the war, Orion would serve as a gunnery training ship for about a year before being sold for scrap in 1922.

Introduced in Update "Air Superiority", HMS Orion follows HMS Dreadnought in the Bluewater fleet. Compared to Dreadnought, she features heavier armour and more powerful guns at 13.5-inch compared to the 12-inch battery of Dreadnought. Notably, she maintains the same top speed despite the increase in capability. Unlike Dreadnought though, HMS Orion comes in a 1914 refit, meaning she lacks even the paltry pair of 3-inch anti-aircraft guns. This means aircraft have essentially free reign over the Orion, and is a very noticeable weakness.