Hulk enhancement was the first form of power enhancement mastered by China, and by now, it had made tremendous progress.
The Hulk's power drew upon anger, erupting with unimaginable strength. In theory, it had no upper limit, which was why the angrier the Hulk became, the stronger he grew.
But if one merely pursued strength without retaining reason, one would only become a slave to power. That was clearly not what China wanted.
Therefore, the candidates for Hulk transformation were all strong-willed soldiers. After gaining the Hulk's power, these soldiers were generally able to control it perfectly, without any loss of control.
Even while remaining completely rational, these soldiers could use their power to perfection.
As for strengthening—or rather, training—the Hulk's power, China also had a highly effective method: magic.
Modern China possessed a highly refined magical system, including illusions. This type of magic existed in both Kamar-Taj and Asgard, and Loki could even be called a master of illusions. Using illusions to make soldiers experience enraging events often unleashed even greater power.
And for soldiers, what could be more infuriating than anything else?
Naturally, it was personally experiencing war. That war of the past had produced far too many tragedies across China, and placing these soldiers within such illusions could better ignite their rage and grant them stronger Hulk powers.
At the same time, these illusion spells ensured that the soldiers would never forget their hatred. Later generations had no right to forgive others on behalf of their predecessors.
Thus, certain old debts would always be settled.
Once the Hulk's power had been increased, it would never decline again. Therefore, China had different illusions specifically meant to improve the soldiers' strength. Powerful Hulk soldiers could now be considered the most stable enhancement method, and they could also be combined