Death Chamber

Death Chamber is Knuckles' penultimate stage, and the twelfth stage of the Hero Story, in Sonic Adventure 2 and Sonic Adventure 2: Battle. It is a treasure-hunting stage and can be unlocked in mulitplayer in SA2 Battle after beating Hero Story. The music for the stage is "Deeper".

Plot
After locating the entrance to Dr. Eggman's pyramid base, Sonic and co. find that the door to a rocket that will take them to the Space Colony ARK, where Eggman is located, is locked. Sonic persuades Knuckles to find the three keys to the door so they may proceed.

Overview
The first goal to this level is different from all the other levels belonging to Knuckles. Instead of finding Master Emerald shards, he's actually looking for three keys to unlock a door. This level, like some others in the game, has quite a few ghosts in it. King Boom Boo is the following boss after this stage, and Egg Golem following right after that.

Upgrade
The upgrade in the stage is the Hammer Gloves, which allow Knuckles to break open iron boxes.

Trivia

 * Oddly, despite being inside Eggman's Hidden Base, the Egg Beetle Security System is not used, unlike Rouge's stage, Egg Quarters where it was used.
 * This stage is similar to Rouge's Egg Quarters, yet the Egg Quarters is Rouge's second stage while the Death Chamber is Knuckles' fourth stage.