Reve begged to differ, "No, they were actually sane-minded. They just figured that their souls were of no value to them. They scaled the value of power higher than their souls."
In a way, Reve could connect with the warlocks. After all, when he went into Amethyst's palace, he was of the opinion that death was around the corner for him. He wanted the power of Amethyst and was ready to give any part of him if asked.
That was just how desperate he was.
Shaking his head, Reve moved on to the next school of magic, "Invocation. The practice of magic involved the use of vocal words. Magic words that adhere to the pillars of reality. These magic words were said to have descended from the words of creation pronounced at the beginning of the world. Wizards were especially required to have gained recognition of the world before they could practice this school of magic."