i had to battle a boss, look like a wraith, but i don't remember the name, in mooshu, in ancient burial grounds, but i had to go in the Spirit world. That could be a new world, the Spirit World.
or a futuristic world, where computers attack, and the teleports are broken, so they send you somewhere else.
any other ideas? maybe one kinda like mooshu and unicorn way put together, and have us fight evil unicorns.
or make a new world where we can fight some of the monster that we can summon with our cards (besides the ones now) like vampires, storm sharks, stormzilla, hydra, etc etc