Carceri — the Red Prison, the Great Cage — could be said to be the gentlest of the evil planes. It's not. Granted, some of Carceri looks like it might even be habitable. But delve beneath the surface appearances, and it's apparent that this plane's just as dangerous as the others in its own intransigent way. It's a place of darkness and despair, of passions and poisons, of betrayal greater than the heavens above. On Carceri, hatreds run like a deep, slow-moving river. And there's no telling where the tide of treachery is going to turn next. Carceri's one of the strongest prisons in the multiverse. This plane held the exiled Titans before humans ever walked a world, and even then was the unwilling home of powers who fled the world of knowledge. These days it claims even more prisoners; the petitioners filling its valleys, seas, and swamps have spawned evils the plane had never before seen. The plane's not called a cage for nothing. Getting in is easy enough, but leaving's a bit more problematic. Look at it this way: [The Titans](https://adnd2e.fandom.com/wiki/Titans_\(LL\) "Titans (LL)") have been looking for a way out for eons. What makes an ordinary berk think he can escape so much easier? The Titans were imprisoned here by [the Greek powers](https://adnd2e.fandom.com/wiki/Ch_7_\(LL\) "Ch 7 (LL)"), but it's a sure bet their jailers didn't choose Carceri by accident. The dark is that a body put here can only escape when he's become stronger than whatever imprisoned him in the first place — and that's a near-impossible task on a plane whose very nature breeds despair, betrayal, and self-hatred.