In a normal fight against a normal opponent, each contact that the scorpion demon has with its opponent will weaken them. But Aeternus isn't normal and this isn't a normal fight. The scorpion could weaken the blades of flame with its pincers and successfully defect them or even break them apart. But Aeternus isn't slowing down.
Aeternus would make contact with the pincers but the sin energy of the scorpion would be burned away once it comes in contact with the chaotic flames on his body instead of affecting him. The stingers the scorpion demon usually relied on didn't work because Aeternus never allowed them to touch his body. That left their only hope to the beholder.
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