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Upon arriving in the corrupted universe, Evolution Zero had little interest in the array of weapons and other implements scattered about. While they could wield any weapon with flawless precision and unnatural strength, alien, metal implements such as these were not their forte. The potion, however, was curious, and Zero snagged a sample of it, stashing the bottle within their plastic biomass. 

Zero marveled at the ruined world outside. It was strange, to be in any world, and this out of all of them. Zero's lungs picked up radioactive and carcinogenic particulates, and filtered them out, adapting against the atmospheric pollutants. However, as soon as their foe appeared, Zero's reflexes set off into overdrive. They assumed a chameleon-like dermis, blending in with the dingy, wrecked world around them. Zero then developed additional eyes and other sensory organs, not only to track Hachiman, but to measure the abilities of their comrades.

Only when a weakness had been revealed did Zero take their chance to strike. They dropped their camouflage, and their mass swelled unnaturally as they took on a new, more combat-ready skin. The chimeric form their rippling, metallic flesh eventually settled into was a huge, silver serpent the size of a double-bus. They had an eyeless, tapered, alien head which split into a mouth that opened like a flower of many muscular jaws lined with venom-tipped fangs. With speed like a train leaving station they surged toward Hachiman, roaring with the hunger of a billion worlds stripped to the bone.