Goonhub suggestions!

[Winklabom]

Reset the damage stats; they're highly suspect of potential "shenanigans"; 2,147,483,647 brute damage on a single mob....yeah.

Oxygen is about the only one that seems anywhere realistic.

My guess is somebody made a massive murderbox* and repeatedly pressed the activation button.



* A graviton accelerator+crate contraption with a single seated mob in the middle. It will deal absolutely ridiculous amounts of brute damage to whomever is seated in the middle.