Starting with the River Styx, My Fate with the Evil Dragon

I am a noble dragon and a demon wizard, and I am known to break my promises. The Holy Lord's original words. Oh! Bring it to you. What's mine is mine, whether it's treasure, magical knowledge, or unused abilities. Even if I put it in a warehouse to gather dust, I won't let it go. Gilgamesh? Baby, don't run away! Ah ha ha ha This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.