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The Klingon Civil War of 2411.

House United was the 23rd "season" update to STO video game: Star Trek Online, released for PC on 25 May 2021. House United follows a previous season update, House Reborn from 26 January 2021.

The missions "Warriors of the Empire" and "A Day Long Remembered" conclude the storyline of the Klingon Civil War of 2411. A new Task Force Operation (TFO), "Remain Klingon", is part of the "Qo'noS Endures" event.

On 14 September 2021, House United was succeeded by season 24, "Reflections".


The PC Patch Notes for 5/25/21 establish the split of the "Warzone" mission group, moved "Mars, the Bringer of War" and "Alpha" to the re-formed "Vigilance" mission group. "Warzone" now covers the internal house-vs.-house conflicts, while "Vigilance" covers the conflicts outside of the Empire.

The PC Patch on 6/24/21 replaced USS Voyager-J inside Earth Spacedock with the USS Grissom (NCC-96380).

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Season 23 dev blogs[]

Other releases[]



Star Trek Online seasons
Common GroundAncient EnemiesGenesisCrossfireCall to ArmsUnder SiegeNew RomulusThe SphereA New AccordThe Iconian WarNew DawnReckoningEscalationEmergenceAge of DiscoveryMirror of DiscoveryRise of DiscoveryAwakeningLegacyHouse DividedHouse ShatteredHouse RebornHouse UnitedReflections

Season 23 images[]


  1. STO - Klingon Civil War mission: "A Day Long Remembered"

External link[]