Su Xinyan fell silent for a moment before continuing, "Fang Zhou, to summon Mutated Undead Creatures, you first need the ability to perceive their soul fluctuations. Then, during Meditation, you must resonate with these fluctuations, understand their essence, and integrate that understanding into your Summoning Magic."
"More importantly, Mutated Undead Creatures are powerful because they have, to some extent, broken through the limits of their original forms and strength. This requires that when you summon them, you not only need sufficient Mana, but also a corresponding level of Spiritual Will. Otherwise, even if you successfully summon them, you might not be able to control them and could even suffer their backlash."
