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Power Negation is the psionic ability to temporarily cause another EVO's ability to become inactive, or at least greatly dampened.
It appears that EVO must be within a certain radius of the possessor to be affected. If the user possess the necessary skills then he could interfere with others ability with little to no effort on his part. However, this effect can be partially overcome, it is not invincible but it can only be overcome with great effort.