I will certainly solidify the idea more as I go, but the basic concept would be a 1000 square grid, pre-mapped out by me... with most of the squares being nothing, but certain squares containing items, clues, people, powers, or traps... Each turn, every character would have the ability to move a certain number of squares dependent on their race, abilities, terrain, boosts etc. Each turn, other characters will also move about the grid, creating chances for interaction etc.
The reason your characters are here, is to bring back a loved one from the grasp of death itself. Death has agreed to let you all compete for the chance to bring your loved ones back.
The ultimate goal would be to reach death, and convince him as to why he should allow you to possess the life crystal. A crystal that will ultimately let the holder bring back someone from the realm of death itself. Will you reach it? Can you convince Death? What challenges lie in store.
like I said this is just a feeler.. if it's too vague, keep checking back and I'll update as I can.