Zhao Hai knew a little about the cultivation techniques of demonic cultivators, such as the refined corpse, skeleton monsters, and dark spirits. These were the most common demonic weapons, and the refined corpse was the most common.
Corpse refinement was to use a special refinement method to refine some corpses into zombies. These successfully refined zombies could be refined many times, but to find a suitable item, it also depended on the foundation of the zombie.
For example, the corpse of an immortal soul second level cultivator would naturally be much stronger than the corpse of an immortal soul second level cultivator. After being refined, an immortal soul second level zombie would also be much stronger than an immortal soul second level zombie.
