The Index

 is a Corpus Arena-style mission type hosted by Nef Anyo on Neptune, in which Tenno and elite Corpus units fight to earn credits and other prizes.

Investment
Before entering the Index, players must select an Investment amount in Credits that they must pay in order to enter. There are three different investments: This Investment will determine the Personal Point Target a player has, which is a designated amount of Index points that a player must personally deposit and score in the match. If a player achieves their Personal Point Target during the match, their invested Credits will be returned doubled after the match, earning the player profit. However, if the player wins the match but doesn't achieve their Personal Point Target, then their investment is only reimbursed without interest, and if a player loses the match they will lose their investment completely.
 * Low Risk: Costs, gives profit. You need to deposit 25 Index Points to win.
 * Medium Risk: Costs, gives profit. You need to deposit 50 Index Points to win, and will have one stack of the debuff Financial Stress throughout the match.
 * High Risk: Costs, gives profit. You need to deposit 100 Index Points to win, and will have 2 stacks of the debuff Financial Stress throughout the match.

Mechanics
The goal of the Index is to earn Index score for the team through the collection of Index Points, which are dropped by participants killed in battle. Represented as green, glowing diamonds, Index Points can be collected by walking over them, and then deposited to a designated bank location in order to earn the actual Index score. Every point deposited will add 10 more seconds to the timer, prolonging the match duration.

Financial Stress: A player can hold multiple Index Points at once, and will gain bonus points for depositing large amounts at once (e.g. depositing 5 Index Points at once will grant +2 bonus points, for a total of 7 points added). However, holding large numbers of Index Points will reduce the player's health and shields, and constantly drain energy. All of these effects are proportional to the number of Index Points held, and is delivered through the Financial Stress debuff displayed by the player's HUD to the upper right.

The player's team will win if they score more Index Points than the opposing team before time runs out. If by the end of the match the players happen to tie, the tie goes to Nef Anyo.

Limitations
Energy and Health orbs are only available at preset dispenser locations throughout the arena, spawning periodically. Players are unable to use Companions and Sentinels during the match, and they are also unable to use Gear items.

The Brokers
Brokers are the elite Corpus units that participate in the Index to oppose the Tenno. These Brokers are divided into 4 different groups, with each group being selected at random as the opponents for a particular match.


 * -|Trading Group =

Rewards
Aside from the bonus Credits earned from completing an Index match, at the end of match special Index Mods will be rewarded. Like the Executioner Mods introduced with Rathuum, these mods are special augments for certain weapons:
 * Kinetic Ricochet (Tetra)
 * Medi-Pet Kit (Kubrow/Kavat)
 * Pain Threshold (Warframe)
 * Shield Charger (Sentinel)
 * Static Discharge (Prova)
 * Thermagnetic Shells (Detron)
 * Tether Grenades (Penta)
 * Flux Overdrive (Flux Rifle)

Operation rewards

 * 5 completed matches: The Index Badge, Access to The Index: Stage 2
 * 10 completed matches: Exilus Adapter, Access to The Index: Endurance
 * 100 total score in Endurance: The Index Sigil