Undead World

This campaign setting is in the future and involves that fact, that the undead took over the world. They managed to kill off most of the gods, and the remaining ones are hiding. Clerics no longer exist and paladins are hard to become. The elves have been killed and the dwarves have retreated closer to the underdark. They humans and other species have formed a resistance group with vampire hunters as the backbone. Vampires have become the captains of the undead and liches are the rulers. They own all of the four islands, and almost no forms of nature exist. They islands have shallow seas you can walk across, and there are boats. Some one invented a skimmer that uses magic to heat the air under it and cause it to float. It also has a wind spell to provide propulsion. There is only 10 of these though and they are hard to find. There is also an oasis that is a hidden garden. This is the only place where nature exists. The characters can either be undead trying to hunt down the hidden gardens and other resistance bases, or they could be rescued from the undead to help free their world.