The Undying Magus

Orpheus Athanasiou was a young, weak student that faced every difficulty a weak magus faced. Being called a late bloomer by everyone because of his poor ability affinity and was bullied for this reason but it all changed when he was sent on a school expedition, which everyone thought was to kill him.

Right there on the expedition, he met an elemental beast that seemed to be guarding an ability orb. While trying to save himself from the assault of the beast he absorbed the element in the orb not knowing whether the orb was corrupted or not.
On waking up, the beast told him that he absorbed an element that contained the soul of its former user

Time went on until a prophecy was made that the life of humanity as a whole is at stake and they needed to embark on a quest to enable them fend off the danger.
Orpheus was chosen as one of the people to embark on this quest where he met the four guardian beasts. They took him to the Universe who told him that he was the chosen one in a prophecy

Which prophecy?
What will be his fate from then onward?