The Descent Begins

You fall through the rift. Reality peels away around you - the Celestial Citadel, the sky, the world, all shrinking above you as you descend into darkness. And then you land. The Abyssal Rift. The first layer. Shattered celestial ruins float in a void-sky, and void-wraiths drift through the broken towers. Zariel's voice reaches you from impossibly far above: "You made it. The rift is sealed behind you - the only way forward is down. Six layers. Six bosses. Six keys. Each key opens the next layer. The first key - the Abyssal Key - will form when you destroy the Abyssal Maw, the rift's living mouth. I believe in you, brave one. I always have. Since the temple cellar. Since the rats. Now finish what we started."