Kluster didn't give up on training them on the necromancy path. In fact, he became obsessed with this through the years, making the boys face death over and over again using the most painful methods and then dragging them to some dead bodies with the expectation of them making an undead somehow.
As a mage trying to conjure an element without affinity, it simply didn't work every time, blinding Kluster from their true capability to control all the other elements with mastery even with their young age.
They reached rank C with only three years old, with five they were rank B, and with of nine, they were already rank A. Kluster was always very proud of Yuriel and Isaac when talking to the public, but at the bottom of his heart, he considered them both as another failure.
