The Strongest Main Character

Erik was summoned to another world. A world of bloodshed and tyrannical rulers and extremely powerful deities... When he was summoned, he discovered that he had an ultimate class. The main character class, and not only that. He was also the strongest main character! "Hmmm, you're a king, so what?" "Hmph, you're my enemy.... so what..." He walked into the world not fearing anything.