The Orokin Vault
The Orokin Derelict
If you are interested in going vault hunting, you must create not only Dragon Keys but Orokin Derelict Keys as well. The Dragon Keys must be equipped in your gear wheel. One key can only be equipped at a time. To increase your chances of being able to open a door in the Derelict, you should group up with 3 other people with all different keys. If you are able to open the vault and if the mission goes successfully you are guaranteed one corrupted mod. The door can be very tricky to find. It may take you a while to find, or you might find it within the first few minutes. Take your time, and don't rush!
Orokin Vault
Corrupted Mods
Corrupted Mods are dual stats mods, where one stat being a bonus, the other being a negative side effect. One Corrupted Mod will be awarded to each player after a member of the Cell successfully opens an Orokin Vault. Each Corrupted Mod has an equal chance to drop. A few pictures of some corrupted mods are below.