The moment those Primordial beings fell, their bodies turned to mana, getting sucked into the world once again, but something remained even after their death.
Their cores.
The Primordial core, which no one was able to awaken even after so long. That core never disappeared from this world.
Along with that discovery, something else was found there.
They could change their cores, not with something else, never, but with the Primordial core, they could.
It was the first core to ever form. There was no such mana that it couldn't hold inside it.
The same went for the one who took the core. Their bodies did not reject the Primordial core at all.
In fact, it was more compatible than his original Transcended core.
Not only did the core fit well within him, but it also increased his powers manyfold.
When this information was realised, the war became even more intense.
