Corrupt Soul Unison
From Inga no Kusari wiki
Corrupt Soul Unison is Negate's crezca.
Negate's crezca has a passive effect on the hollow's body, that accumulates over time. A combination of the hollow's own reiatsu, its physical body and the surrounding reishi in the air become a semi-physical substance, similar to slime or tar. This black, odorless substance constantly drips from Negate's completely black body, and sticks to most, if not all surfaces.
The ooze is capable of taking shape, bending, accumulating and spreading by Negate's own will, but it comes with a downside; The longer Negate's passive crezca is active, the further it's body degrades into the black slime. Without something to keep it's soul stable, Negate would eventually be unable to maintain its physical form at all. While this isn't exactly deadly for Negate, the hollow would much rather maintain the form of a human, or something similar, than that of a monster... thus, comes the ability of its crezca.
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Crezca Abilities
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Corrupt soul unison allows Negate to achieve perfect harmony with another living being, by permanently bonding its own soul with it. In order for this to occur, Negate must have first come in contact with the living being in question, physically; To be more precise, it must get some of it's black slime onto the living being's body in order for them to be a transferable host. Spirits and living beings with strong souls are immune to the effect of Corrupt Soul Unison, meaning that Negate can only bond with weaker souls (npcs). Because it is incapable of bonding with a stronger soul, it cannot gain any spiritual abilities from this fusion at this stage.
By bonding with another soul, Negate takes over their body and mind. In doing this, it and the living being become a single being; Negate and the host's personalities merge, causing Negate to pick up traits of the host before possession. Physically, Negate's body takes on roughly the same shape as the host that it bonded with; The difference being that Negate therein hollowifies the person's body when it takes over, giving it Negate's mask, hollow hole, and black skin. Indeed, regardless of what species Negate bonds with, the outcome will always be a hollow, so long as Negate is the dominant soul.
Successfully bonding with a living being stops Negate's passive crezca effect for a time. With a host form to maintain it's soul upon, Negate doesn't have to worry about the degradation for some time. However, the ability can only be used once the degradation starts again, so it is only capable of using Corrupt Soul Unison every once in a while, depending on the last host that Negate used it on (once every 2 threads).
Strengths
Pros: Corrupt soul unison allows Negate to become one with another creature, therein adopting it's traits, knowledge, and personality to some extent. In this, Negate is potentially capable of attaining a vast amount of experience regarding mankind, making it better capable of dealing with situations less like a hollow, and more like a human when needed.
Weaknesses
Cons: The ability can only be used when the passive effect of it's crezca is active. On top of which, using the crezca itself at this point doesn't grant him any new power or skills; It simply allows him to keep a human form. The effect is also not instant, and cannot be used to escape death by immediately jumping to another soul.
