Whether it be Cain or Keon, both of them thought that the three treasures vanishes after it was used to turn back time
None of them had expected that the treasures were actually hiding inside Cain. In fact, even Cain himself did not know that the treasures are with him
He didn't sensed them at all!
If not for the ritual this time, Cain might lived his whole life without knowing that he possesses these treasures
It can be said that the Three Pillars of the World although barely holding on are still smart
They still devised a plan to defeat the remnant power of the Demon Lord even though the three Pillars are busy stabilizing the world
They were only waiting for the right time when the remnant power was not hiding in the body of a royal
Once the remnant power was taken out, it is now time to defeat and destroy it!