Foundation of Heavenly Darkness!
Even after Ace 'True Soul' returns to its normal state and becomes more powerful he still was in a coma because the shock he sustains was too great.
But this didn't stop his dark void to keep devouring the heavenly qi at all. The density of Qi in the land of cities was quite low however, the dark void didn't seem to be fazed by it either because it was drawing Qi from heaven itself.
Suddenly, cracks began to appear on the dark void and Ace's Qi Meridians, because they were both connected. The cracks spread slowly but the devouring of heavenly qi didn't stop a bit. The next moment it was as if the dark void couldn't take it anymore and finally shattered with Ace's Qi meridians!
Ace's whole body jolt by this sudden shock and black blood began to flow out of his orifices.
Qi Meridians are like roads inside the body these roads were pathways for Qi to circulate inside the body smoothly. Without these pathways, the body can't use or store Qi.