Obelisk

You wake up in a cold hallway. You don't know how you got there, but as your vision clears, you notice two fellow adventurers. They are as confused to how they got there.

The only way out is up. You are inside one of the feared Obelisks that have been spawning across the land. Legend has it no one has ever made it out alive, the shifting maze merely growing upward as new floors are open.