After consuming the Nurturing Spirit Netherworld Fruit, Shi Hao's Soul Force rose sharply, alleviating his immediate crisis, but unless he addressed the issue of the slow enhancement of Soul Force, it would become a bottleneck continuously choking the improvement of his cultivation.
From the academy's side, he could also exchange Contribution Value for corresponding treasures, but their value was shockingly high. Unless Shi Hao could wipe out an extraordinarily large gathering of Elemental Creatures, it would be utterly extravagant for him to do so.
Actually, most people wouldn't feel the urgency as he did, even if their cultivation improved faster due to slaying in the Elemental Cave, it wouldn't be to an unbelievable extent.
But Shi Hao was different, his Black Hole Physiognomy could directly devour energy to nourish him, letting his cultivation soar as if he had grown wings.