Mammon was once one of the 72 Devils of the Abyss, a being of incomparable arrogance and power.
Now, he lay on the ground like a hapless monster, helpless and ready for slaughter.
His core ORDER divine power had already been depleted in the battle, and his existing injuries, aggravated by the new wounds inflicted by John, left him astonishingly weak.
Aside from the natural resilience granted by his demonic lineage, he now had no special abilities to speak of.
Well, that's not entirely accurate.
This Devil's formidable mental abilities remained intact.
It was unfortunate for Mammon that none of his bewildering mental attacks had any effect on John.
Therefore, to say that John could kill this Devil effortlessly would be an understatement.
And indeed, John had no intention of sparing Mammon's life.