Lords of Gossamer and Shadow: Hero's Rise
The expanse of the Grand Stair known as Hero's Rise was once the contest ground for two masters of cosmic forces. Each sculpted worlds to challenge a single hero designated by their opponent. This "game" played out over centuries, changing hundreds of worlds forever.
Now, Wardens of the Stair are assembling to safeguard this expanse from depredation and uncover the ancient secrets hidden past its many Doors. They answer the request of a venerable Master of the Stair that assures them a great destiny is playing out and that these worlds will need heroes once more.