The One I Loved.

Grey was in the Void of Time for an estimate of half a year, but in the actual world it had only been a few hours. During that time Jinx and Raziel were his adversaries as they tried to mold him to summon and control his grace.

Through the same way he got stronger by fighting Azazel in the Veil of Shadows they had hoped to achieve the same results but this time they would teach him exactly what to do for control.

His power was growing fast but since he was a soul not limited by a fregile shell, he could let it spiral out of control without any consiquences. However, this still overwhelmed him as he was still trying to tame his grace and limit it to what he thought he could handle but it could not be limited. It was like trying to stop a waterfall with your bare hands. A wild depiction but accurate. So, they taught him to command it instead.