The Azure Sky Royal Court has always been an enemy of The Empire. They entangled The Empire's Eastern Legion and even had an elite force infiltrate the Imperial Capital, coordinating with traitors within the empire to stall the Inspectors' Knight Order.
Already very weakened, Yanjiang naturally did not want a strong empire to continue threatening them, but they also did not intend to directly send forces to interfere with The Empire, so they only provided a vial of 'Ice Prison Calamity Ash.'
Finally... Canaan Moore.
The Fifth Energy Level being of that generation of elves keenly noticed that if Terra continued in such a situation of one superpower and many powers, Canaan Moore would only have to submit. If Canaan Moore wanted a future, The Empire had to weaken, so that Canaan Moore would have enough value in the eyes of The Empire.
So, they provided the technology for 'Split Soul.'
In fact, they did not know that, aside from themselves, others would take action simultaneously.
