I Was Promised a Superpower Awakening, So What’s This About Being the Progenitor of Vampires?

[Transformation-based powers + Begins as an immensely strong vampire progenitor + High-martial world + Ever-changing forms + Succubus + Character growth] This is an era in which people around the world awaken powers. Everyone automatically awakens an ability upon turning eighteen. At the tolling of the bells on his eighteenth birthday, Gu Changge… promptly falls asleep!!! When he wakes up, Gu Changge: “Who is this silver-haired, crimson-eyed beauty!?” Gu Changge has no time to celebrate his awakening. All he feels is the sorrow of his brothers leaving home! On this day, the New Era welcomes its ultimate great demon king. I, Gu Changge, progenitor of the vampire race, primordial true demon, the Immortal Realm’s foremost goddess of war, the primordial first true spirit, the Creation Spirit, Lord of the Olden Days, the sole ruler of the myriad heavens, founder of the Supreme Mystic Arts’ Primordial Ancestral Court… Countless otherworldly races, gods, and supreme powerhouses: “Wait, there’s no room here. Who are you people, anyway?!” Gu Changge: “Take a guess~”