Blood trickled from the corner of the Foxman's mouth, growing progressively more copious.
On the surface, it was imperceptible, but Fang Jie knew that the Foxman was actually burning his Life Force. A Demigod's lifespan is indeed limitless, but this lifespan refers to the rate of recovery being faster than the rate of consumption.
That is to say, within a short period, the lifespan actually has its own limits. If too much is burnt, it could permanently affect oneself, such as showing signs of aging.
Though Demigods have methods of recovery, the cost is considerable.
If too much Life Force is burned, it could impact one's foundation, causing an inability to advance or even regress in Strength. More severe cases could involve burning all the Life Force and dying on the spot.
Fang Jie felt that the Foxman was insane, for burning Life Force was far too extreme.