Azaroth constructed this array around William's body to boost the Vitality Sucking Life Binding Parasite. He wanted it to activate the potential within it.
Once the Vitality Sucking Life Binding Parasite's potential was activated, its sucking power was significantly boosted.
Along with that boost, this parasite was also fooled into thinking that William was overflowing with vitality.
The parasite would instinctively only suck the amount of vitality that would weaken William but not kill him.
Right now, it felt that no matter how much vitality it sucked, it wouldn't affect William.
However, this couldn't be any more misleading. William could feel an unreal pain in his heart as even his Spirit was being affected.
This Vitality Sucking Life Binding Parasite's true potential was terrifying. It was even tearing apart William's spirit.