Aura

Auras work in a similar way as Mods do. Unlike Mods, Auras affect the entire team. Additionally, Auras add to your total mod capacity, unlike regular mods. This allows an unranked Warframe to equip mods.

Equipping an Aura in a slot of the same polarity doubles the additional capacity (5 becomes 10). In a slot without polarity, the capacity is the same as listed, and in a slot of a different polarity, additional capacity is 80% of listed value, rounded down (5 becomes 4, 9 becomes 7, ect.).

The Aura slot can be polarized with a to fit the user's needs.

Auras can be sold for 500 at Rank 0.

Acquisition
Auras are obtained as alert mission rewards.

Trivia

 * Aura Mod cards were converted from user's Artifacts as of Update 9, including additional copies if the user obtained more than one artifact before the update.
 * For a short time after Update 10.6 some Auras (as well as some mods) could have been acquired via transmutation. This was due to a bug where all mods (including the unreleased ones) became obtainable through transmutation. This has been fixed, though some Auras (such as Dead Eye) have since been released. The list of retrieved auras can be found in Category:Retrieved Content.
 * Sometimes if a game is lagging, the aura effect may not occur or be delayed.