The Orokin Vaults, also known The Golden Door by the Ostrons, are special vaults found in the Orokin Derelict tileset on Deimos missions which require a unique void key to unlock, called a Dragon Key.
Unlocking the VaultEdit
There are four types of Dragon Keys, and opening an Orokin Vault will require the player to have a matching Dragon Key equipped in one of their gear slots. Corrupted mods are awarded for successfully retrieving a corrupted artifact from an Orokin Vault and delivering it to extraction. All Orokin Derelict missions, except for Defense and Assassination, always contain exactly one vault, with the required key to open it being randomized. Only the player that opened the vault will have their key consumed.
Dragon Key Blueprints are obtained through the Clan Dojo's Orokin Lab. When carried in the gear, the key produces a debuff to the player's Warframe, and the key is consumed upon unlocking the vault. It is possible to equip all four keys simultaneously but all their debuffs will stack, but it is generally easier to play with a full squad where each Tenno carries an individual key, as certain Warframes have stats or abilities that allow them to circumvent or even negate the penalties.
Inside these vaults appears a very large, all-white, and aged Excalibur Prime statue that resides on the far wall with hands outstretched, between which is the artifact. It only takes one player to remove the artifact, but all players in the squad will be awarded its contents upon extraction.
When removing the artifact from the vault, the artifact inflicts a random Dragon Key penalty on the Warframe who picked it up (thus, it's possible for said player to have 2 of the same penalty assuming they still have their Dragon Key in tow). Furthermore, the Corrupted will appear, replacing all enemies spawned beyond this point, in an attempt to stop the Tenno from leaving with the artifact.
If by any way the Tenno gets inside of the vault without opening the door, they will be forcefully teleported outside of the door.