Dungeon Delving Advanced
What are Dungeons of Alyseas? Those are fortress-like entrances to once glorious plane of Alyseas. Now, this plane is inhabited by malevolent creatures called aberrations, whose ability to shape reality is unlimited. While they were ravaging the plane of Alyseas to their fitting, they were literally ripping at space-time, causing gateways to other planes to open. However, beings with shape too big to fit in gateway couldn't pass through them, so they started to conquer other worlds bit by bit.
You're a party of adventurers who heard of such dungeons. While the actual reward for closing even one of them is enormous, these dungeons are home to legendary Artifacts of Alyseas, which grant a bit of aberration's power. Will you come victorious or stay in the dungeons as a minions for the evil to come?