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[[File:Update 18.4.1 Shadow Debt.png|Operation: Shadow Debt|660px|center]]
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{{quote|The Stalker has found others as twisted as himself. He calls them his Acolytes and he's sent them after ME?!

SHHH. I have to be very quiet, they cloak, they could be hiding anywhere… listening to this.

I'm calling in my favor. Break into Corpus and Grineer installations and steal their security data. With enough data, I can determine their cloaking patterns and turn the tables on
these…betrayers."|A message from Alad V}}

'''Operation: Shadow Debt''' is an event released with {{ver|18.4.1}}. Calling in his favor from [[The Second Dream]], [[Alad V]] requests the Tenno's aid in hunting down the [[Stalker]]'s newly-minted [[Acolyte]]s. The event started on January 26, 2016 for PC.

==Mechanics==
===What You'll Need To Do===
===='''Tracking Down the Acolytes'''====
*In order to track down the Acolytes, players will first be tasked in acquiring security data from [[Grineer]] and [[Corpus]] systems so that Alad V can pinpoint their locations.
**The first two missions are [[Spy]] missions set on [[Mercury]] and [[Venus]] respectively. Players must successfully break into ''at least two'' data vaults for a successful mission.
**The last two missions are [[Mobile Defense]] missions set on [[Earth]] and [[Jupiter]] respectively. They are otherwise identical to regular Mobile Defense missions.
*Once all the security data has been collected, the [[Acolyte]]s will be detected for the community to locate and hunt down. There are six Acolytes in total.
**An Acolyte will be located on a given planet and players must locate the mission node where he or she is found. Once the Acolyte's mission node is located, their location is announced in the Operations tab in the Mission selection screen.
**To hunt down an Acolyte, players must selected the mission node and explore the map. The Acolyte can spawn in ''any'' location of the map, ranging from dead-end rooms to the mission path. The Acolyte will announce his or her presence to the player in a manner similar to the [[Stalker]] and will spawn shortly afterward.
**Once the Acolyte spawns, players must damage the Acolyte until it leaves, whereupon it drops a mod.
**All Acolytes have a global health bar that is reduced by community effort with no given time limit. Once the health bar reaches 0%, the Acolyte is killed. Be warned however; the Acolytes will move to different mission nodes and even planets to evade their hunters, so be vigilant.

===='''Defending Alad V'''====
*Once all of the Acolytes have been defeated, Alad V will message the player in their inbox and sarcastically congratulate them on defeating all of the acolytes, in which he will remark that there is still one left ([[Misery]]). You will then be tasked to complete a defense mission on [[Europa]] with Alad V as the defense objective against 15 waves of Corpus enemies, with occasional shadow versions of the defeated acolytes.
*Once the final wave is complete, Alad will remark that the acolytes are cowards for not showing up in person, in which Misery will appear. Misery will occasionally spawn [[Void Shade]]s that appear to be crawlers that link to misery (just like [[Shield of Shadows]]) reducing the damage to Misery as long as they are linked to him.
*Once Misery is defeated, the player will get a random assortment of mods from the pool of all the acolytes. The mission can be re-played to gain more of the mods but they will have to endure the full length of the mission each time.
*Interestingly, all Corpus enemies that spawn in the mission will appear (but not named as) shadows, perhaps implying that all the enemies in the mission are either Misery's fallen allies, or enemies he has killed on his way to Alad. However, it is noted that any Specters spawned in the mission will have this shadow effect applied to them also.

===='''Endurance'''====
*After defending Alad V from misery, the player then has the option to do a more challenging version of the mission, which requires to player to defeat waves of Acolytes. At least 15 waves are required to get the [[Lacera Acolyte Skin]].
*It is identical to the normal defense, except Misery spawns in at every 5 waves (3 times minimum for the reward) and the max energy of players is reduced to 50.

===What You Need To Know===
*This Operation will last until 5 Acolytes have been killed by the community, plus the three days that the 6th will be available.
*While it's not required to have encountered any of the first 5 Acolytes before facing the last Acolyte, it is encouraged to hunt them down for Mod collecting and helping out the community goal.

===The Acolytes===
<gallery widths="175" perrow="3" hideaddbutton="true" position="center" captionalign="center" spacing="small" bordercolor="transparent">
StrikerAcolyte.png|link=Angst|<s>'''[[Angst]]'''</s><br>''Agile and ferocious''<br>{{text|green|'''Defeated'''}}
HeavyAcolyte.png|link=Malice|<s>'''[[Malice]]'''</s><br>''Disciplined and accurate''<br>{{text|green|'''Defeated'''}}
RogueAcolyte.png|link=Mania|<s>'''[[Mania]]'''</s><br>''Elusive and deadly''<br>{{text|green|'''Defeated'''}}
AreaCasterAcolyte.png|link=Misery|'''[[Misery]]'''<br>''Zealous and patient''<br>{{text|red|'''At Large'''}}
ControlAcolyte.png|link=Torment|<s>'''[[Torment]]'''</s><br>''Arrogant and calculating''<br>{{text|green|'''Defeated'''}}
DuellistAcolyte.png|link=Violence|<s>'''[[Violence]]'''</s><br>''Fast and vicious''<br>{{text|green|'''Defeated'''}}
</gallery>

==Rewards==
{| class="wikitable" style="width: 100%;"
|-
! style="width: 25%;" | Collect 4 Cloaking Data
! style="width: 25%;" | Defeat 10 Acolytes
! style="width: 25%;" | Defeat Final Challenger
! style="width: 25%;" | Clear 15 Waves against Final Challenger
|-
|style="background:radial-gradient(#3F565D, #0F181B);"|[[File:ProjectSinisterPhaseOneRewards.png|150px|center|link=]]
|style="background:radial-gradient(#3F565D, #0F181B);"|[[File:ProjectSinisterPhaseTwoRewards.png|150px|center|link=]]
|style="background:radial-gradient(#3F565D, #0F181B);"|[[File:Vulkar.png|150px|center|link=]]
|style="background:radial-gradient(#3F565D, #0F181B);"|[[File:StalkerMiosAltSkin.png|150px|center|link=]]
|-
|
*Acolyte [[Sigil]]
*[[Orokin Catalyst]]
|
*Acolyte [[Warframe Cosmetics#Event Emblems|Badge]]
*[[Orokin Reactor]]
|
*[[Vulkar Wraith]]
:&nbsp;
|
*[[Lacera Acolyte Skin]]
:&nbsp;
|}

===Acolyte Drops===
{{CustomCollapsible|Acolyte Drop|acolytedrops}}
{| class="listtable sortable" style="width: 100%; text-align:left;"
|-
! style="width: 25%;"  | Name
! Rarity
! Type
! Description
! style="width: 15%;" | Dropped By
|-
| [[Blood Rush]]
| data-sort-value="2" | Uncommon
| Melee
| Increases Critical chance as the Melee Combo Multiplier increases.
| [[Torment]]
|-
| [[Body Count]]
| data-sort-value="1" | Common
| Melee
| Extends the duration of the Melee Combo Multiplier.
| [[Angst]]
|-
| [[Weeping Wounds]]
| data-sort-value="2" | Uncommon
| Melee
| Increases Status chance as the Melee Combo Multiplier increases.
| [[Mania]]
|-
| [[Maiming Strike]]
| data-sort-value="3" | Rare
| Melee
| Increases the chance of a Critical Hit on slide attacks.
| [[Violence]]
|-
| [[Hydraulic Crosshairs]]
| data-sort-value="1" | Common
| Pistol
| Increases Critical chance while aiming for a brief time upon a headshot.
| [[Torment]]
|-
| [[Argon Scope]]
| data-sort-value="3" | Rare
| Rifle
| Increases Critical chance while aiming for a brief time upon a headshot.
| [[Torment]]
|-
| [[Laser Sight]]
| data-sort-value="2" | Uncommon
| Shotgun
| Increases Critical chance while aiming for a brief time upon a headshot.
| [[Torment]]
|-
| [[Sharpened Bullets]]
| data-sort-value="2" | Uncommon
| Pistol
| Increases Critical damage while aiming for a brief time upon a kill.
| [[Violence]]
|-
| [[Bladed Rounds]]
| data-sort-value="2" | Uncommon
| Rifle
| Increases Critical damage while aiming for a brief time upon a kill.
| [[Violence]]
|-
| [[Shrapnel Shot]]
| data-sort-value="1" | Common
| Shotgun
| Increases Critical damage while aiming for a brief time upon a kill.
| [[Violence]]
|-
| [[Pressurized Magazine]]
| data-sort-value="3" | Rare
| Pistol
| Increases Fire Rate while aiming for a brief time upon reloading.
| [[Angst]]
|-
| [[Spring-Loaded Chamber]]
| data-sort-value="2" | Uncommon
| Assault Rifle
| Increases Fire Rate while aiming for a brief time upon reloading.
| [[Angst]]
|-
| [[Repeater Clip]]
| data-sort-value="2" | Uncommon
| Shotgun
| Increases Fire Rate while aiming for a brief time upon reloading.
| [[Angst]]
|-
| [[Embedded Catalyzer]]
| data-sort-value="2" | Uncommon
| Pistol
| Increases Status chance while aiming for a brief time after casting an ability.
| [[Mania]]
|-
| [[Catalyzer Link]]
| data-sort-value="1" | Common
| Rifle
| Increases Status chance while aiming for a brief time after casting an ability.
| [[Mania]]
|-
| [[Nano-Applicator]]
| data-sort-value="3" | Rare
| Shotgun
| Increases Status chance while aiming for a brief time after casting an ability.
| [[Mania]]
|-
| [[Narrow Barrel]]
| data-sort-value="3" | Rare
| Shotgun
| Temporarily increases accuracy while aiming after hitting an enemy.
| [[Malice]]
|-
| [[Focused Defense]]
| data-sort-value="1" | Common
| Melee
| Increases armor while channeling with a melee weapon.
| [[Malice]]
|-
| [[Guided Ordinance]]
| data-sort-value="2" | Uncommon
| Assault Rifle
| Temporarily increases accuracy while aiming after hitting an enemy.
| [[Malice]]
|-
| [[Targeting Subsystem]]
| data-sort-value="2" | Uncommon
| Pistol
| Temporarily increases accuracy while aiming after hitting an enemy.
| [[Malice]]
|}
{{CustomCollapsible/End}}

===Clan Trophies===
All participating Clans will receive an event trophy for their attempts on the bonus final challenger mission. The following table lays out which Trophy your clan will earn depending on the Sum of all participating Members best Wave.

{| class="listtable" sortable" style="width: 100%; text-align:left;"
|-
! Clan Tier !! Terracotta Trophy !! Bronze Trophy !! Silver Trophy !! Gold Trophy
|-
| [[File:LeaderBadgeGhostHolo.png|x26px|link=Clan#Clan Tier|Ghost Clan]] [[Clan#Clan Tier Multiplier|Ghost]] || 25 Waves || 50 Waves || 75 Waves || 100 Waves
|-
| [[File:LeaderBadgeShadowHolo.png|x26px|link=Clan#Clan Tier|Shadow Clan]] [[Clan#Clan Tier Multiplier|Shadow]] || 75 Waves || 150 Waves || 225 Waves || 300 Waves
|-
| [[File:LeaderBadgeStormHolo.png|x26px|link=Clan#Clan Tier|Storm Clan]] [[Clan#Clan Tier Multiplier|Storm]] || 250 Waves || 500 Waves || 750 Waves || 1000 Waves
|-
| [[File:LeaderBadgeMountainHolo.png|x26px|link=Clan#Clan Tier|Mountain Clan]] [[Clan#Clan Tier|Mountain]] || 750 Waves || 1500 Waves || 2250 Waves || 3000 Waves
|-
| [[File:LeaderBadgeMoonHolo.png|x26px|link=Clan#Clan Tier|Moon Clan]] [[Clan#Clan Tier|Moon]] || 2500 Waves || 5000 Waves || 7500 Waves || 10000 Waves
|}

==Notes==
*Each Acolyte will hide on a random mission node. Tenno must fan out and scout all mission nodes in search of the Acolyte. Once an Acolyte is found, all Tenno will be alerted of its presence within the Acolytes tab of the World State Window.
**The Acolyte will remain on that node until a set amount of damage (currently 50,000 total) has been dealt to it (cumulative from all Tenno contributing).
**Once the Acolyte has taken its beating, it will find a new node to hide in and the Tenno must search for it once again.
**Acolytes can be found on any [[Nightmare Mode]] and [[Invasion]] missions on the node, but not [[Syndicates#Syndicate Alerts|Syndicate Alerts]].
*On mission nodes where they can be found, the Acolyte is hidden within a random room on the map. Upon entering the room the Acolyte is hidden in, the screen will flicker, similarly to other invaders ([[Stalker]], [[Zanuka]], etc.).
**This means that the Acolyte may be hidden in dead end rooms, or conveniently along the main path of the mission. Acolytes can also spawn in the map's starting room.
*The Operation-only [[Spy]] nodes on [[Mercury]] and [[Venus]] can reward items not usually found in normal missions, such as [[Transmutation#Transmutation Cores|Transmutation Cores]].

==Tips==
*The Acolytes are not immune to Warframe abilities. Use whatever means possible to take them down. Beware, however, that [[Violence]] can cancel warframe abilities in the same manner as the Stalker, including Focus abilities.
**Crowd Control abilities, such as [[Rhino]]'s [[Rhino Stomp]] or [[Nova]]'s [[Molecular Prime]] can be effective at stopping the Acolyte in its tracks. Using certain augments such as [[Frost]]'s [[Chilling Globe]] will also be able to completely freeze them '''if''' it successfully procs.
***[[Equinox]]'s [[Rest & Rage|Rest]] will '''not''' affect Acolytes.
**Damaging abilities, such at [[Banshee]]'s [[Sonar]] or Nova's [[Antimatter Drop]] can do massive amounts of damage to the Acolyte.
***Note that you can only do a limited amount of damage to the Acolyte within any given mission.
**Status Effects will not lock down the Acolytes. Therefore, abilities such as [[Ember]]'s [[Accelerant]] will not stagger the Acolyte (damage will still be increased).

==Trivia==
*The date on Alad V's ingame message is January 18th, 2016, which marked the event's intended release goal prior to development delays.
*The event was originally developed under the name ''"Project Sinister"''.
*Although [[Torment]] had already been defeated by January 26th, she was officially revived following the changes to Acolyte drops in {{ver|18.4.3|fix}}. This resulted in four Acolytes active simultaneously, and lasted until [[Angst]] was defeated on January 28th, and she was not revived afterward.

==Media==
<gallery position="center" widths="300" spacing="small" hideaddbutton="true">
Warframe - Operations Shadow Debt
Warframe - Operation Shadow Debt
Warframe - How to beat Operation Shadow Debt
Warframe Event (Shadow Debt) + Awesome New Mods!
OPERATION SHADOW DEBT - Acolyte Hunt & Rewards Warframe
</gallery>

{{EventNav}}
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