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The latest Star Trek Online story update, Season Twenty-four: Reflections, is now live!

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Faction Khitomer.png Impossibility of Reason
EP - Impossibility of Reason.png
Followed by:
May 14, 2019
1,041 Expertise icon.png
You will receive the following reward:

Impossibility of Reason is the second of two missions released with Rise of Discovery featuring Gabriel Lorca and Ellen Landry. Following from the loss of Aakar, the player finds themselves stranded on the ice moon of Priors 5D with Lorca and Landry, trying to survive against the elements and the Klingons hunting them.


Mission text[]

DSC Starfleet[]

This Klingon computer virus is giving me a bad feeling about things. With J'Ula and House Mo'Kai involved, I think we're looking at a serious new effort to capture or destroy high-value Starfleet targets... ships, personnel, or even entire planets.

Let's rendezvous with the Buran as fast as we're able. That virus is already in her systems, and after what we just dealt with, I'm guessing the Klingons aren't done with my ship just yet.


The Priors World simulation has provided some very interesting data. Starfleet Command wants to expand on what we've learned, and the latest simulation should help with that.

Your participation in this simulation is important, though the subject matter may be... sensitive. We're asking you to step into the aftermath of the battle at Priors World. You'll be dealing with the actions of J'Ula and her forces there, under extreme conditions. Good luck.


Analysis of the Priors World simulation data continues. Several agencies, including Imperial Intelligence, want to expand on that data, and they've created another simulation to do so.

Your participation in this simulation is required. The simulation will require you to step into a situation all true warriors should be prepared to face - the aftermath of defeat.

I trust you will rise to this challenge and face it with honor. Qapla'!


The data acquired from the Priors World tactical simulation has been quite... enlightening. Our analysts, in their tireless search for knowledge, have requested further study on the matter. And, thus, another simulation has been created.

Your participation in this simulation will be most informative. I should warn you, however. The simulation will place you directly into the aftermath of the battle at Priors World... on the losing side. You'll be dealing with the actions of J'Ula and her forces, under extreme conditions. May the Elements guide you well.


I bring you greetings from the Founders. May you always serve them well!

A great amount of fascinating data has been obtained from the resent Priors World tactical simulation. Naturally, the quest for knowledge is a never-ending one, and so a new simulation has been commissioned. Your participation in the newest simulation is required, of course.

It's important to note that the subject matter may be... challenging for a soldier of the Dominion. It will place you into an unfamiliar situation - that of defeat, in the aftermath of the battle at Priors World. You'll contend with the forces of J'Ula, under extreme conditions. Honor the Founders. Victory is Life.


Get Captain Lorca to Safety.


  • Captain on the Brink
  • Iced In
    • Go To Priors 5d
    • Fetch Supplies from the Shuttle
    • Emergency Transport Capt. Lorca
    • Head for Shelter
      • Situation Update
      • Fetch the Fallen Shuttle Components
      • Drive Off Ice Beasts
      • Fetch the Fallen Shuttle Components
    • Check on Lorca
    • Re-heat Rock with Your Weapon
    • Make Camp
  • Snow Place Like Home
    • Talk to Lorca
    • Talk to the Team
    • Talk to Landry
    • Search Fumaroles for materials (3)
    • Exit the Fumaroles
    • Return to the Cave
    • Give Supplies to Kerwin
    • Place Explosive Charges
    • Talk to Patel
    • Camp for the Night
  • Frozen Heart
    • Talk to Kerwin
    • Ambush Klingons at Fumaroles
      • Defeat Jackal Mastiffs
      • Take Up Ambush Spots on High Ground
      • Ambush Klingons from Above
    • Fall Back to the Cave
    • Reach Lorca
    • Defend the Cave
      • Melt a Hole Out the Back
      • Escape Out the Back
      • Talk to Lorca
  • Contact Command



House Mo'Kai[]


NPC starships[]



Icon Name Description How to Get Points
Agents of Yesterday Arc icon.png Ice Ice Baby Activated a Subspace Party Amplifier in the cave on Priors 5d After you first enter the cave, activate a [Subspace Party Amplifier] just before you "Check on Lorca."

Note: The mission does not give you a Subspace Party Amplifier. You need to purchase one before starting the mission.



For a walkthrough of this mission, visit the Walkthrough page.

Mission Replay[]

This mission is repeatable through Mission Replay, although the Rewards for completing will be reduced. Items scale to a player appropriate level (Scaling Rewards), as follows:

Level Rank Experience Point icon.png Expertise icon.png Mark <>
1–9 Lieutenant 780 195 II
10–19 Lt. Commander 1158 675 IV
20–29 Commander 1552 1338 VI
30–39 Captain 1743 1878 VIII
40–49 Rear Admiral 1935 1856 X
50+ Vice Admiral+ 1935 2148 XI


  • During the Defend the Cave you must allow the House Mo'kai invaders to pass the opening where the bomb is placed. If they are killed before passing the bomb's point mission will not advance.

External links[]

v · d · e
All Starfleet Factions Starfleet-only
Faction KDF.png Klingon Defense Force-only
Faction Romulan Republic.png Romulan Republic-only
Faction Dominion.png Dominion-only
Faction Khitomer.png Cross-faction
Mission available Side Content: The Galaxy at Large
See also: Featured episodePatrolRemoved MissionsTask Force Operation