Maybe...something to fight?

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An impending doom...maybe a glitch? Killing players from the inside. Those who die by this...creature feel as if they are dying in real life, becoming more suicidal and soon enough killing themselves. The creature manifested to those who attempted to destroy the Crucible of Worlds and in defense created 'This'...though, gaining it's own decision it attempts to destroy everything within the Crucible of Worlds and including the Crucible itself, realizing that it is only a tool the creature wants to become something more than that and thus goes on a killing spree.