I Became a Necromancer Sealed for 1000 Years

In the MMORPG ‘Tower of Avalon,’ I, who possessed a necromancer vampire, was betrayed and schemed against by the protagonist’s party. Deceived by their lies, I was bound in iron chains and sealed in the deepest, lightless dungeon for an eternity. After a millennium of gnashing my teeth in anger and betrayal, On the thousandth year, the seal was finally broken. Now, all that remains for me is an overwhelming desire for revenge.