We have our team, but we need a setting. Let's try this one:

The adventurers have arrived at a dragon graveyard on an island in the middle of the ocean, about a two-week journey by boat from land, not as isolated as something like Polynesia or other pacific islands. Having arrived from their own homelands, each adventurer has just met the other at the shore this forbidden island, and they are preparing to make their way into the graveyard. The island itself is named Ophia, although few call it that. Most know it as the "island of the dead", and it surely lives up to that title. Most of the island is covered in dead rock, ashen soil, and various grave sites, burial mounts, catacombs, and the like. Thousands of years ago, the island was established as a burial place for dragons and their servants, many of which request to be buried there when they died, others were killed alongside their lord centuries in the past. Still others were the victims of sacrifices to the dragons. 

The cumulative effect has been to reduce the island to a mostly lifeless rock, which is very roughly circular, with a diameter of about 30 kilometers at its widest point, with a width of about 20 km at most others. The treasures buried here are legendary, but are guarded by virtually every kind of undead imaginable: skeleton, zombies, spectres, liches, wights, vampires, mummies, even a few kinds which are unique to Ophia. Although the treasures include the typical gold, silver, and gems, the most valuable are magical and historical in nature. Lost scrolls which exist nowhere else contain unknown history, along with some amazing and terrible knowledge, some of which is best left forgotten.