Fomorian Sabotage is a special Sabotage Alert variant that involves using Archwings to engage and destroy a Balor Fomorian before it reaches a Relay.


Similar to Alerts, Fomorian Sabotage missions will show up once the construction has reached 100% from completing invasion missions. They appear on the star chart as mission nodes, appearing beside the chosen planet's active Relay. Each Fomorian Sabotage mission has a timer displaying the time until it reaches the relay, along with a health counter showing the percent of health it has remaining.

In order to participate in a Fomorian Sabotage mission, a player must have an Archwing available, as well as a Fomorian Disruptor equipped in their Gear menu. Note that Fomorian Disruptors require Omega Isotopes to craft, which are available as random enemy drops from any non-Archwing mission node on the planet where the Fomorian Sabotage mission is present.

In mission, players must make their way into the interior of the Balor Fomorian on the other end of the map, dealing with threats along the way including Zeplens and the Balor Fomorian's own weaponry. The Fomorian's entrances are protected by energy shields that bar players from entering, and must be brought down by destroying two shield generators located at the top of the Fomorian.

Once inside the Fomorian, a player must activate their Fomorian Disruptor in order to remove the protective shielding on the Fomorian Power Core, which will allow it to be damaged by weapons for 30 – 40 seconds, depending on the planet's difficulty. Unlike with normal Sabotage missions, the goal is not to destroy the core outright, but instead deal as much damage as possible to the core within the short window that the shield is down. While the entirety of the Power Core can be damaged, there are 16 large power nodes on the core which can be destroyed to deal more damage to it.

The Power Core's shield will reactivate after the vulnerability duration has expired, at which point players have 30 seconds with which to evacuate from the Fomorian ship and escape into a safe distance of 350 meters (1,400 Archwing meters) away from it. The mission successfully ends once the 30 seconds are up, and a player manages to safely escape.

The damage dealt to the Fomorian Power Core on a single run will result in the Fomorian's overall mission health being reduced, accumulating as more missions are run against it by the community. The Fomorian Sabotage alert ends once the Fomorian's overall health has been reduced to 0. If a Fomorian is not destroyed before the time listed for it to reach the Relay is over, the Fomorian will destroy the Relay, permanently removing said Relay from the star chart.


Upon completion of the mission, all members of the squad will receive one of the following:

View Rewards List


  • Archwing Abilities are nullified within a 1,400 meter radius around the Fomorian Power Core (listed as 350 meters on the HUD), preventing their use. This is, not coincidentally, the distance the players must fly from the core to extract safely.


  • Fomorian Sabotage was first featured in the Operation: Eyes of Blight Event, featuring multiple Balor Fomorians assaulting the Tenno Relays. This mission type was only properly introduced into the game as an occasional Alert in Hotfix 17.7.1.

Fomorian Sabotage HistoryEdit

The following table keeps track of the Fomorian Sabotage alerts since Hotfix 17.7.1

Event Date PC PS4 XB1 Switch
2015 October 15 Larunda (Mercury) Kronia (Saturn) Orcus (Pluto) -
2015 November 23 Kronia (Saturn) Kuiper (Eris) Vesper (Venus) -
2016 January 14 Orcus (Pluto) Strata (Earth) Leonov (Europa) -
2016 February 24 Larunda (Mercury) Kronia (Saturn) Orcus (Pluto) -
2016 May 11 Kronia (Saturn) Kuiper (Eris) Vesper (Venus) -
2017 June 26 Orcus (Pluto) Strata (Earth) Leonov (Europa) -
2017 September 4 - - Leonov (Europa) -
2017 September 20 - Kronia (Saturn) - -
2017 October 27 Kronia (Saturn) - - -
2018 January 6 - Strata (Earth) Vesper (Venus) -
2018 February 6 Larunda (Mercury) - - -
2018 April 2 - - Orcus (Pluto) -
2018 May 1 - Kuiper (Eris) - -
2018 May 16 Larunda (Mercury) - - -
2018 July 11 - - Orcus (Pluto) -
2018 August 1 - Kronia (Saturn) - -
2018 October 2 Strata (Earth) - - -
2018 November 16 - Strata (Earth) Leonov (Europa) -
2019 January 15 Kronia (Saturn) - - -
2019 February 21 - Kuiper (Eris) - -
2019 March 8 - - Vesper (Venus) -
2019 March 13 - - - Larunda (Mercury)
2019 April 19 Orcus (Pluto) - -


2019 April 26 - Strata (Earth) - -
2019 June 3 - - Orcus (Pluto) -
2019 July 15 Kronia (Saturn) - - Kuiper (Eris)
2019 July 30 - Larunda (Mercury) - -
2019 September 16 - - Leonov (Europa) -
2019 September 30 Orcus (Pluto) - - -
2019 November 4 - Kuiper (Eris) - -
2019 November 20 - - - Kuiper (Eris)
2019 December 27 - - Strata (Earth) -
2020 January 2 Strata (Earth) - - -
2020 February 6 - Strata (Earth) - -
2020 February 27 - - - Leonov (Europa)
2020 March 31 - - Orcus (Pluto) -
2020 April 29 Kronia (Saturn) - - -

Patch HistoryEdit

Update 27.4
  • Fixed a harmless script error that would occur at the end of a Fomorian Assault mission if any core nodes were destroyed right as the shields were going back up.
  • Fixed a script error that would occur if you died trying to reach a safe distance from a Fomorian before it exploded.
  • Fixed script error that would occur if you crashed during a Fomorian Assault and managed to restart and reconnect to the mission during the escape sequence.

Update 24.0

  • New Archwing Mod drops have been added to the Balor Fomorian (*final stats available in game):
    • Cryo Coating (Archwing Melee): Increased Cold/Status Chance
    • Ion infusion (Archwing Melee): Increased Electricity/Status Chance
    • Infectious Injection (Archwing Melee): Increased Toxin/Status Chance
    • Charged Bullets (Archwing Gun): Increased Electricity/Status Chance
    • Hypothermic Shell (Archwing Gun): Increased Cold/ Status Chance
    • Contamination Casing (Archwing Gun): Increased Toxin/Status Chance

Hotfix 22.17.1

  • Changed drop rates:
    • 400 Endo: 75.88% → 38.72%
    • Imperator Vandal Blueprint: 11.06% → 38.72%
    • Imperator Vandal Barrel: 11.06% → 11.28%
    • Imperator Vandal Receiver: 2% → 11.28%

Last updated: Update 24.0

See alsoEdit

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