I had a thought about the quest, if you guys are up for it. If we don't have an idea for floor 26s theme, it could be a medieval European city surrounded by fields and forests. An NPC enters the city and stays at the southern gates. When one asks what's up with him, he responds that his sister was kidnapped by evil knights in order to be fed to a dragon. he then requests that you help rescue her. If you accept, the quest <<Rescue the Damsel>> begins. The NPC gives each member of the team a special item, <<Dragonlance amulet>> whose effect is the only way that one can damage the beast.(paints He also escorts you to the beginning of the dragon's domain, a cave in the deepest part of the forest. When the players get there, they are set upon by the evil knights. These enemies are approx. seven feet tall and wear full black plate armor. They also have impressive, curling ram's horns. If the players defeat the knights, they can enter the cave and find that it is quite labyrinthian. The players navigate the tunnels and end up with the dragon and a young, beautiful woman tied to a stalagmite in a wide cavern. [I]FIGHT![/I] Kenshin gets eaten or stomped or impaled on a stalagmite. (I haven't decided yet but I'm leaning towards the last one.) if beaten, the dragon drops scales and claws that can be used to forge new weapons or upgrade current weapons, lotsa money (also opens a hidden door to his treasure trove if the players notice (it's hidden around the back of a stalactite nearly touching the floor)), and the players get to keep the amulets. The amulet abilities change to increasing damage against dragon type enemies. 

sorry this is so long, but I was pretty excited when I came up with the idea.