From the introduction:
The Spire is a massive pillar, rising from endless wastes, serving as home to an intricate ecosystem of cruelty. From the slimes, beasts, and exiled thugs of the Exordium, to the guardians, knights, and slavers that fester within the City, to the writhing masses, creatures of darkness, and transient horrors that stalk the Beyond, this is no place for the weak.
Enter Neow, an ancient whale seeking to bring this place to its end. She empowers adventurers to sally forth, climbing through fifty floors of malice, and at the end of their journey lies the malevolent Heart that beats within the uppermost chambers. The core of the Spire itself.
But the Heart will not fall without a fight. Rallying its own champions from throughout its depths, it gathers fearsome spirits, automata, gremlins, and more to stop the adventurers in their tracks.
In another version of things, you might be one of those adventurers, seeking to cleanse the evil that dwells within. But this time? This time, you’re gonna be the villain.