After exploring for a while, Yang Ling found the technique of casting Roar of the Dead Souls.
Using Wizard Power as a base and Mental Energy as the guide, he could limit the direction or even the area of the skull's attacks. But, the more controlled the attack was, the more Wizard Power and Mental Energy he would expand.
Furthermore, he had accidentally discovered another type of attack by the Crystal Skull – Soul Assimilating Light Ray, two dark pillars of light fed from the skull's eyes like laser beams.
As long as they had been shot by the dark red pillar of light, the souls of ordinary Zombies and Mummies would immediately be destroyed, and they would fall over with a bang! Not to mention the small fries who were in the front lines. Even the Spirit Snake King and the Mummy Commander who were hiding behind the Undead Army were extremely concerned.