Herk could Kill Levi

Herakles’ incredible mind and intuition had already found the answer.

A dimensional folding phenomenon. Increasing the durability of the flesh in the same manner as certain kinds of sword techniques by folding multiple instances of a singular event or object over each other through extra-dimensional manipulation. It was not simply a matter of coming up against more matter as it was that the matter was folded over itself by refracting it through multiple higher dimensions.

[A frustrating defense mechanism.​]

I gritted my teeth and delivered the final blow.

One-hundred.

With a crack like thunder, it landed, and Leviathan was thrown backwards as the accumulated force slammed into him like a freight train. The concentrated boom of the sound barrier shattering a hundred consecutive times — or maybe only once, magnified a hundredfold — echoed, and for a short moment, pushed away the falling rain as it rippled outwards.

I was right earlier, then, I thought as my feet touched back upon the ground. Herakles could not defeat Leviathan in a single blow or a single use of his Noble Phantasm. It would be possible, eventually, to do enough damage and reach the core at the center. With enough time and effort, killing Leviathan was possible.