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Emerald harnessed the power of the Demons to forge Soul Contracts, infusing them with his Celestial Winds to create Celestial Wind Soul Contracts, which the desperate twelve or so Chaos Spirits swiftly accepted.
This contract barred them from seizing control of his body or using it for selfish purposes. Everything remained under Emerald's command, and he was merely providing them a "temporary home" for the time being, as Chaos Spirits decay and perish outside their Realm unless it is infused with Miasma or they inhabit a vessel.
With the contract complete, the Chaos Spirits fused with his right arm, merging with his soul. That side of his body transformed, sprouting black, crimson, and purple feathers, with red eyes and twisted jaws emerging across his now larger, more muscular arm.
"It's peculiar how you're such an ideal vessel… perhaps your vast soul, despite its apparent 'emptiness,' has always been your gift," the Alter Ego remarked.
