Wizard Heli walked expressionlessly to the center of the wizard formation, simultaneously placing the "soul bead" loaded with many grieving souls atop the "kerosene lamp" in the center of the formation.
The souls inside the bead seemed to be drawn by a strong force at that moment, beginning to howl and struggle; their terrifying screams echoed throughout the hall, yet were restrained to this small, enclosed space by the power of the wizard formation.
These wails were so intense that they could be considered a kind of sonic witchcraft attack. Should an ordinary person hear these ghastly death wails, they would likely feel dizzy and disoriented, at the least falling seriously ill, or possibly even having their consciousness obliterated by the powerful sonic impact, turning into a walking corpse in the truest sense.