Rune: The Tale of the Obsidian Maze - Carlos Sanchez, Flying Eye Books

After defeating the Shadow King, Chiri and Dai are settling into their new lives in the magical land of Puddin'. However, there is always more evil to fight against, and this time, the evil is coming to them. After being invited to the Obsidian Maze to fight the sinister MidKnight, Chiri and Dai are about to encounter the deepest darkness there ever was, and they're not sure if they're both going to make it safely back to their friends.