Plague Reaper's coat could not only summon jaws but also transform another's energy, flesh, and blood into his own, eventually unleashing that power on his enemy.
Last time, Plague Reaper used this ability when Oskar almost managed to sever his head with his massive sword. Then, the jaw ripped Oskar's arm off, swallowed it, and turned it into energy.
Plague Reaper couldn't use this ability too often because it provoked a strong recoil, between each use he needed a long break so his body wouldn't collapse.
But... Unfortunately for Nessa, Plague Reaper was more than ready to unleash on her the full force of the veritable ocean of energy he now had in his hands.
His coat, the ghastly jaw absorbed the entire Scarlet Pyromancer, Top-8 monster, his genes, and Katrin's right arm.
Given how powerful the attack had been last time, Adam and Osana and their Operators realized that now Plague Reaper would demonstrate a completely different level of power and Nessa was the victim.
