The Sevakrill were a race of aliens with the ability to possess humans. They ate human flesh. They were at war with the Charnal horde. On 23 October 1843, two Sevakrill possessed the designers of Nelson's Column. The two aimed to construct a missile inside the Column as part of a strategic ploy in the war against the Charnal horde. They also used the Endovorms as guardians, disguising them with a perception filter which made them look like stone lions. (PROSE: The Lions of Trafalgar)

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