Nightmare Sorcerers

Nightmare Sorcerers (Ch. 528) - new type of sorcerers which appeared due to Three Rings Celestial Sorcerer.

These type of sorcerers can be grouped into different levels/stages:
 * the stage where they were able to freely return to the Sorcerers World,
 * the stage where the Nightmare Sorcerer possessed the hunter talent,
 * the stage where the Nightmare Sorcerer's body never died,
 * the stage where Nightmare Sorcerers became Nightmare Hematology Sorcerers,
 * the stage where they were Nightmare Sorcerer-Apprentices,
 * the stage where they were official Nightmare Sorcerers.

Glenn was the Sorcerers World's first official Nightmare Sorcerer