Grace Mirchea Luslec

Grace Mirchea Luslec (그레이스 미르치아 루슬렉, Geuraeiseu Mireuchia Luseulaek, Grace Mirchia Luslec ) is Slayer No. 1 and the living "God" of the most dangerous and secretive criminal group, FUG, in The Tower.

Although FUG’s true motives and goals are not clearly known, it is true without a doubt that they exist in the shadows of the Tower, hiding and corrupting. People call Luslec the "God of the Devils" ( 악마들의 신, Ahkmahdeuleui Shin ) or "Demon King" ( 마왕, Mahwahng; 魔王 ).

Luslec was one of those that helped the Ten climb the Tower. No one knows how or why he has fallen to becoming the leader of a such a dangerous group.

Apparent in his ranking, Luslec is a powerful warrior. They say that there is nothing his great black Hook can't pierce.

Even though the FUG has dangerous status, the influence of Luslec's group can never surpass the Family Heads of the 10 Great Families, as long as they hold contracts with the Tower's Guardians.

Nevertheless, Luslec holds a rank that surpasses a few of the Family Heads. This is because he represents the "Absolute Darkness" of the Tower.