History of Checking the Chamber

Checking the Chamber is a triumph. The game data has no description or objectives for it, and no page I opened describes it.

Unconfirmed

The requirements, seal and reward are unknown. A Bungie forum thread I opened discusses a missing triumph for entering a chamber in a raid ("chamber of wishes"), but it does not name this triumph, so I'm not claiming a link. Check the in-game triumph entry for the objective.