For the wizards of Silver Moon City, Hades had actually encountered them before.
Long ago, due to the existence of the undead, he had noticed the inventions created by humans.
Compared to the low intelligence of most undead and the long years needed to gradually awaken their wisdom, the life box created by humans was intriguing.
It could directly transform a rational and intelligent life form into an undead being that is close to death, and obtain what can be called undying life, with the cost merely being the dilution of their humanity and emotions as mortals.
In the eyes of the Underworld King, this certainly didn't count as a cost, so he once sent subordinates to understand the related issues, even using things longed for by mortals to exchange for their research.
In recent years, Hades had even recruited some powerful spellcasters from among the mortals, transforming them after death into this very special life form.
