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- "Uh oh, you really made an ERROR in your defense tactics HAHAHA"
— Exo 404
Exo 404 is an Exo who was able to betrayed the guardians and obtained the power of the darkness, he is being hunted down by a lot of factions yet he already has a kill count.
He seems to go in hiding for awhile but then he comes back out in the second collapse to give the Shadowkeepers a new problem to deal with.
At some point in time after the Collapse, he would be recruited by the Overtakers as a weaponized virus that would help their commanders launch an assault against Mallory's doppelgangers.