Creating Bloodlust?

It was as if monsters charged as hordes of black-scaled humanoid beasts, and two identical humans slaughtered their way free, without caring what or who obstructed them.

It had been four days now and Shane couldn't even remotely understand what was going on, as he was unable to leave the battlefield that he had entered unknowingly.

The only thing that prevented him from crying in despair was the countdown he could see by thinking about the system, which slowly neared its end.

From this, Shane concluded that one hour outside the Dimension-sphere was 1 whole day inside the battlefield, which was a shocking thing to figure out.

He was not sure if this applied to all martial art techniques or solely because the [Slaughterer's path] technique required him to enter a battlefield in order to create killing intent and bloodlust at the same time while intertwining them with each other seemed to be the final goal.