Well To Answer this Question, 1st I'll Explain a Nomi and Semi Nomi. Chaos Sorcerer is a Semi-Nomi That Can Be Special Summoned via By Any Other Cards Effects after being Special Summoned Correctly. A Nomi Is a Monster that can only be Special Summoned by their own Summoning Conditions. So An Example of a Nomi monster Would be Armed Dragon Lv.7. Even after being properly Summoned, Once he leaves the field and into the graveyard, you cannot bring him back with Call of the Haunted becaise he is a Nomi Monster. Level Modulation was made to ignore the Nomi Part of The Monster, But Only After Being Special Summoned Correctly.