What's this?! Another school of Embodiers? And what's this aura coming off them...?

The School of the Dark Serpent consists of corrupted students of the Abyssal Tortoise, whose ability to warp reality by twisting their bodies has turned their flesh to those of unnatural creatures.

Ye Jiu is demonstrating the basics of their techniques by manipulating her finger joints beyond the range of other Embodiers.
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Fundamental: Digit Deformity

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