Minecraft Dungeons:Radiant Ravine

Radiant Ravine is a secret level in the Minecraft Dungeons Hidden Depths DLC. It can be unlocked from finding a secret scroll in Coral Rise.

Trivia

 * There is a secret area in a cave in which you don't need to monitor your oxygen. Vindicators, geomancers, creepers, skeletons, and zombies spawn there.
 * This makes this level and the Abyssal Monument the only levels to have areas where the player doesn't have to monitor their oxygen.
 * This was the second level that was confirmed for the Hidden Depths DLC, where it was confirmed in a tweet.
 * This level has a unique ending sequence, in which the ground around the trident begins to disappear and then the platform is shot into the air by a stream of lava.
 * It also has the longest ending countdown.
 * This level also has its own loading screen picture, making it the only secret level having such.

obsidian chests
one obsidian chest location is not too far into the level. (possibly depending on the generation) in an intersection of a few different paths, there is a path to the right (possibly depending on which angle the level is on) that has a portal. the portal has two long strips of coral on the right and left. when you go inside, the only enemies are tropical slimes. on a ledge with a portal on it, you will see the obsidian chest. to get there, keep going through the pathway, and at the end get onto the clam, and it will launch you over to another section. this section is directly above the first. when you proceed, you will eventually come across another portal. this will teleport you to a small section, in which is very straight, just run through, and there is another portal at the end. once you take the portal, you will be transported to the ledge with the obsidian chest on it. then you can go on with the level