Defeat The Vampire King

In order to defeat the vampire king, Oliver must improve his skills as a knight by entering many dungeons in Rouran world. Each dungeon will give Oliver a power he can use to defeat Vladimir, the vampire king. However, there are many obstacles to defeating various monsters in the dungeon, fortunately 7 rebel vampires are willing to help Oliver defeat many monsters in the dungeon, and work together to defeat Vladimir. Will they be able to defeat Vladimir by gaining the various powers that exist in the dangerous dungeon?