Gods, there is no concept of death.
This also means that any fatal attack is incapable of slaying a deity, and even with overwhelming strength, easily brutalizing a deity does not equate to the complete annihilation of one without the concept of death.
Unless someone can bestow the concept of death upon a deity, or if they inherently represent the end of things, only then can a deity be killed.
Does this mean that gods are beyond reach?
Of course not.
"Pah." The Creation Witch's delicate hand gently tapped on the God of Hell's cheek, with a force that probably couldn't even kill a mosquito.
However, the God of Hell, reflected in her amber pupils, revealed an unparalleled horror, as if he faced a fatal crisis.
"Aargh!" The God of Hell let out a painful roar, clutching his chest with one hand, as if resisting some kind of change.