Zhao Hai only found out about it after the incident. He found out that the cultivators who were killed by the shattering void realm experts all died because their souls were destroyed. There was no way to turn them into undead creatures.
In order to turn a cultivator into an undead creature, there were conditions. First of all, the cultivator couldn't be dead for too long. After a long time, his soul would completely disappear, and it would naturally be impossible to turn them into undead creatures. Secondly, this person's body couldn't be too severely damaged. If it was too severely damaged, it would be impossible to turn him into an undead creature.
Although the space could produce Soul Fire, these soul fires were equivalent to the space's soul. As long as they found a suitable vessel, they could come back to life.
