The millions of yellow sand monsters made these usually pampered elites groan incessantly. However, these undead creatures survive through the summoner's magic power. As long as Su Xin's magic power hasn't been exhausted, they will continue to fight relentlessly.
The Book of the Undead, as one of the world's most precious treasures, has a power that far exceeds any level nine martial weapons. Using it consumes Cred Points for Zhang Menglong, and summoning it also costs credits for Super God Academy students. If the rewards hadn't far outweighed the costs this time, Su Xin definitely wouldn't have used it.
But precisely because of its preciousness, its power is also against the heavens. Summoning undead creatures requires consuming a lot of magic power, but maintaining their existence only consumes a mere one percent of that required for summoning.
