Gamer: Dimensional Mercenary

The MC is an angry and bitter 'hero' that has a vendetta against a powerful being that tricked and deceived him. He gets a gamer-ish power from another powerful being that will help him grow strong, but not overly quickly since it lacks some gamer functions. I don't plan to rush the story too much, but knowing myself, I just jinxed that. He will be visiting worlds that most of you are familiar with, but I might throw a curveball in the future. My grammar is... okay, I guess. I'm not a native speaker, so I'll make mistakes. If you spot them and you aren't too lazy, leave a comment for me to fix them. Chapter length is about 2500 words.