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“It is done. Operation: Rathuum is no more.”
This event has concluded on all platforms.
For the gamemode introduced with this event, see Arena and Rathuum.

Listen up, Tenno. I don’t care if you support Steel Meridian or not, I need your help. An entire company of Grineer defectors was just captured by Kela De Thaym. Now they face Rathuum, Trial by combat. Of course, the fight’s rigged, a show of force to Grineer everywhere, meant to scare off future defectors. But there’s a way we can turn this thing back on Kela, an obscure rule.
All you need to do, Tenno, is take their place in the arena and defeat the Grineer executioners. You game?

—Cressa Tal

Operation: Rathuum is an event released with Update 18.10 (2016-04-29). Taking the place of Grineer defectors on behalf of Steel Meridian, the Tenno must prove themselves in Rathuum – Trial by combat held by the sadistic Kela De Thaym – in order to win the defectors' freedom.

This event began on Friday, April 29th, 2016 and ended Monday, May 9th, 2016 on PC. For consoles, this event began on Friday, June 10th and ended Monday, June 20th, 2016. 

What You'll Need To Do[]


  • Rathuum uses a new game mode called Arena, which is a modified version of Team Annihilation where players face off against Grineer executioners. The first team to attain 25 kills is the winner.
    • Regardless of how many players are involved, the executioners will always outnumber the players by one member; thus a full Squad of 4 players will have to fight 5 executioners.
    • All forms of Gear are disabled during the match (which also disables the use of Emotes) and players cannot bring along Companions of any sort. Players do not need to unequip either of these beforehand; they will be automatically disabled when Rathuum starts and will be returned once Rathuum ends.
    • Before the match starts, a special modifier is applied and announced before the players are released. These modifiers are typically in favor of the executioners, making things more difficult for players.
  • There are 3 special mission nodes located on Sedna where Rathuum is held, each more difficult than the last. Winning a round of Rathuum will award the players Judgement Points, which are used to unlock rewards and Rathuum nodes with higher level ranges. Winning a match can also reward a random Mod, Mod TT 20px.png Fusion Core pack, or Credit Cache depending on the tier of the node.
    • The first Rathuum node is unlocked from the start and has a level range of 20-20. Winning a match at this node rewards 1 Judgement Point.
    • The second Rathuum node requires at least 3 Judgement Points to unlock and has a level range of 40-40. Winning a match at this node rewards 10 judgment Points.
    • The third Rathuum node requires at least 10 Judgement Points to unlock and has a level range of 60-60. Winning a match at this node rewards 25 judgment Points.
  • Once the player accumulates 100 Judgement Points, an additional node will unlock where players must face off against Kela De Thaym in an Assassination mission, in order to liberate the defectors. Take note that accessing this node spends 50 Judgement Points every time, so players who wish to acquire all of Kela's drops will have to get additional Judgement Points.

Assassinating Kela De Thaym[]

  • Kela De Thaym's Assassination mission is largely identical to a typical Assassination mission, where players must locate the room where she spawns and defeat her.
  • Once players reach Kela's boss room, they must activate a series of switches on the walls to fight her. There are four switches on each wall, and players must shoot the switches in order to progress to her arena above.
    • Each group of switches is protected by a metal disc, with an aperture big enough for one switch. The whole mechanism is connected to a floor-mounted Override Switch that is activated when a player steps on it. When the plate is activated the disc begins to spin clockwise, and players must shoot the switch that has turned green in order to access Kela's arena. Be warned, however, as the area is crawling with Armored Rollers that can stagger players off the pressure plates, impeding their progress.
    • The number of switch groups is tied to how many players are there in the Squad; if there is only one player, then only one switch group must be interacted with, and so on.
  • When all the necessary switch groups have been interacted with, the platform in the center of the room lifts, transporting players to Kela's arena. After the cutscene, Kela jumps into the arena and battles the players.
    • Kela is incredibly agile, jumping from platform to platform and even grappling on the upper edges of the arena. Kela can summon Armored Rollers and can launch a salvo of grenades or missiles, laying waste to a large area.
    • Once her health dips below certain points, Kela retreats to a nearby balcony, and the arena is bombarded via orbital strike every few seconds. In order to halt the orbital strike and lure Kela back into the arena, players must shoot switch groups similar to the ones below the arena, complete with Armored Rollers to hinder players.
      • Unlike the switch groups below, players must deal with all four switch groups regardless of player count, and they must shoot each switch in order uninterrupted. Every successful shot causes the disc to spin faster as well, and players only have a limited window of time before the orbital strike begins again.
      • Players only have about 15 seconds to activate the switches during the orbital strikes.
    • When Kela is defeated, she is guaranteed to drop an Executioner-themed mod. She also has a chance to drop the blueprint for the DualKohmak.png Twin Kohmak. The Executioner-themed mod is unknown until players reach extraction, discouraging players from prematurely ending the mission if they get an undesired mod.
      • Players will also be rewarded a random SarynIcon272.png Saryn component once they reach extraction.
      • Defeating Kela for the first time also awards players with the coordinates of the defectors' location. Once the players are back on the landing craft, they will receive a message from Steel Meridian, requesting that they turn over the coordinates to them so they can rescue the defectors.
      • If the players have a Syndicate(s) whose Standing is higher than Steel Meridian's, they will also send a message requesting that the player turn over the coordinates to them instead. Regardless of who they choose, the coordinates are worth ReputationBlackx64.png 10,000, and any alignments that Syndicate may have will also gain or lose Standing (i.e. giving the coordinates to Cephalon Suda will result in bonus Standing for the Arbiters of Hexis, and Standing penalties for the Red Veil and New Loka).


  • Defeating Kela De Thaym will unlock one last Rathuum node, where players must last for as long as possible and gain as many kills as possible before they all die. Players must get at least 25 kills to be eligible for the reward; an Orokin Reactor.
    • Unlike the previous Rathuum matches before it, players will only have one life; if they die, they will not respawn. In addition, the Scaling Enemies and Health Drain modifiers will also be active.

What You Need To Know[]

  • As with most Conclave maps, designated locations periodically resupply Tenno with Ammo, Health Orbs and Energy Orbs.
    • The Health Orbs will restore 150 health, while the Energy Orbs will restore 50 energy in the first two Rathuum tiers and 25 energy in the third Rathuum tier and Endurance.
  • The following is a list of all the possible Rathuum modifiers players may encounter;
Modifier Effect Rathuum Tier
Half Energy Players' maximum energy reserves are reduced by 50%, after taking mods into account.

Tier 2

Half Health Players' maximum health is reduced by 50%, after taking mods into account. Tier 2
Half Shields Players' maximum shields is reduced by 50%, after taking mods into account. Tier 2
Health Drain Players will lose 100 points of health every 5 seconds. Killing an enemy will instantly restore the player's health to full. Tier 3
Low Gravity Gravity is reduced, affecting all airborne Maneuvers. Tier 1
Quick Respawn Executioners and Players will respawn in 2 seconds, as opposed to 8 seconds. Tier 1
Scaling Enemies The levels of the Executioners go up each time they are killed, increasing their durability and damage. Tier 3
Speed Boost The sprint speed of the Players is significantly increased. Tier 1

The Executioners[]

Main article: Executioner


Main Rewards[]

3 Judgement Points 10 Judgement Points 100 Judgement Points 25 kills in
Rathuum Endurance
Orokin Reactor.png

Winning a round of Rathuum may reward you with a Stance mod depending on the tier of the node. Here is a list of potential rewarded stances, arranged by Tier.

Rathuum Tier Stances
Tier 1
(Level Range 20-20)

Mod TT 20px.png Pointed Wind

Mod TT 20px.png High Noon

Mod TT 20px.png Four Riders

Mod TT 20px.png Tranquil Cleave

Tier 2
(Level Range 40-40)

Mod TT 20px.png Crushing Ruin

Mod TT 20px.png Final Harbinger

Mod TT 20px.png Vermillion Storm

Mod TT 20px.png Stalking Fan

Mod TT 20px.png Decisive Judgement

Tier 3
(Level Range 60-60)

Mod TT 20px.png Crimson Dervish

Mod TT 20px.png Astral Twilight

Mod TT 20px.png Blind Justice

Mod TT 20px.png Tempo Royale

Mod TT 20px.png Vengeful Revenant

The mods listed here are dropped by defeating Kela De Thaym, and are all of Uncommon rarity. Unless stated otherwise, each mod can only be equipped on a specific weapon.

Name Weapon Description
Mod TT 20px.png Electromagnetic Shielding Ack&Brunt.png Ack & Brunt Transfers a portion of damage received by allies to yourself while you are blocking.
Mod TT 20px.png Acid Shells GrnDBSG.png Sobek Enemies killed by this weapon explode, dealing DmgCorrosiveSmall64.png Corrosive damage in an area of effect.
Mod TT 20px.png Fomorian Accelerant GrineerFlakCannon.png Drakgoon Increases projectile speed and number of times the projectiles bounce.
Mod TT 20px.png Harkonar Scope All Sniper Rifles Increases shot combo duration while aiming.
Mod TT 20px.png Hunter's Bonesaw Ripkas.png Ripkas Increases damage and status chance when attacking knocked down enemies.
Mod TT 20px.png Nightwatch Napalm OgrisNew.png Ogris Rockets create a ring of fire around their blast radius.
Mod TT 20px.png Rift Strike TwinBasolk.png Twin Basolk Charged attacks teleport to a targeted enemy.
Mod TT 20px.png Vulcan Blitz GrnJetPwrPolearm.png Jat Kittag Enemies killed by this weapon explode, dealing DmgBlastSmall64.png Blast damage in an area of effect.
Mod TT 20px.png Medi-Ray All Sentinels Sentinels periodically heal their owners.

Clan Trophy Rewards[]

All participating Clans will receive an event trophy for their attempts on the bonus final endurance mission. The following table lays out which Trophy a clan will earn depending on the sum of all participating members' best Endurance Round.

Clan Tier Terracotta Trophy Bronze Trophy Silver Trophy Gold Trophy
Ghost 25 Executioners 50 Executioners 75 Executioners 100 Executioners
Shadow 75 Executioners 150 Executioners 225 Executioners 300 Executioners
Storm 250 Executioners 500 Executioners 750 Executioners 1000 Executioners
Mountain 750 Executioners 1500 Executioners 2250 Executioners 3000 Executioners
Moon 2500 Executioners 5000 Executioners 7500 Executioners 10000 Executioners


  • As Helios, Codex Scanners, and Synthesis Scanners cannot be used in Rathuum, Executioners are automatically scanned into the Codex as soon as they spawn.
    • This does not apply to anything that the Executioners deploy or summon, such as Reth Rollers and Kavats.
  • Although fighting Kela De Thaym consumes 50 Judgement Points, accessing her mission node requires 100 Judgement Points, so players will need 100 Judgement Points at minimum to fight her.
  • As of the end of the Operation, the Kela De Thaym boss fight, the Arena mode, and the Endless Rathuum have been added to the base game.


  • This is the first event since Specters Of Liberty which involves a Syndicate as part of its story.
  • At the start of the event, Mod TT 20px.png Medi-Ray was not part of Kela's drop table. This was fixed in Hotfix 18.10.2 (2016-04-30).
  • Other than Steel Meridian, each non-neutral Syndicate has their own reasons for acquiring the coordinates, each questioning your loyalty to the Syndicate. The Syndicate you have the highest standing with will send two emails to your inbox about the matter;
    • The Red Veil wishes to test the defectors' conviction in fighting the Red Veil's enemies, but otherwise will let the defectors join Steel Meridian.
    • The Arbiters of Hexis plan to hold a fair trial to judge the defectors for their war crimes, and punish them if necessary.
    • The Perrin Sequence wants the defectors to answer for their sabotage of Perrin-owned property.
    • New Loka wishes to "cleanse" and judge the defectors, letting any survivors join their ranks.
    • Cephalon Suda wants to analyze the defectors for the sake of knowledge, through "systematic dematerialization".
    • Steel Meridian themselves do not send inbox messages if they are the player's highest-ranked Syndicate, though according to Kela the original intent of the defection was to join Steel Meridian in the first place.



All quotes from Operation Rathuum