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Rimuru channeled the power within her Aura and Soul, releasing a blast of semi-divine spiritual power, which converged each attribute in one. The power was devastating, and no matter how many resistances could Nari possess, it would still deal with a significant amount of damage.
Because she was being possessed by Geggoron's split soul, she had already surpassed the limits of a mortal, her regeneration capabilities were outstanding, and the damage previously deals to her quickly recovered.
However, she and Geggoron's split soul, which was merged with her own mind, could not stop but be baffled by what their eyes were seeing. A mortal was using energy similar to Divine Energy!
This might not be so weird if she were a Legendary Hero or was possessed by a god that was using her body as a vessel, but she was just by herself!