The Worst SSS Class? I Contract a Bone Dragon from the Start

【Fights and thrills! + Invincible among peers + One heroine + Ruthless + Necromancer + Bone Dragon Summoning + Skeleton Army】 Cheng Mo transmigrates to a world where everyone changes class, only to become the one and only SSS-rank class holder: a Necromancer. But his stats are pathetic, his summons are weak, and everyone mocks him as “the disgrace of SSS-rank.” Then the “Unique Class Development System” arrives, binding him to a Mythic-rank summoning spell from the start! Undead Bone Dragons, Death Knights, Fallen Sword Saints, Void Dragon Kings... Every one of his followers is a legend. Even the most basic Skeleton Warrior evolves all the way from fragile bones into an undying Boneguard of the Underworld! From then on, the whole world's style goes completely off the rails: While others are still teaming up to study strategies, his undead army sweeps over everything like a tidal wave; While geniuses are struggling through normal difficulty, he is already clearing Hell dungeons solo as if out for a leisurely stroll. Face-slapping prodigies, stealing monsters to level up, looting the looters, framing his enemies... He has no limits in how he operates. Everyone thinks he's just a somewhat powerful Necromancer. Until the day a Bone Dragon tears through the sky, Death Knights bow in submission, and countless skeletons stand ready behind him. Standing atop a throne of bones, he looks down on all living things: “I told you, my goal is to become the supreme ruler of the undead.” (The pace is slower early on. His power is unleashed after the college entrance exams.)