Ace Combat 8 Mission 29 (Selene): X-40 Fight Phases, Point Values and Prudens Trigger

Missions Last reviewed: Oct 3, 2026

Quick answer

Mission 29 is "Selene" (Operation Lunar Eclipse), set over FCU Capital: Theve.[1][2][3] It has no mission medal.[1] This page covers objectives and tactics only, with no story outcomes.

It is a one-on-one boss mission. The community wiki lists it as Air-to-Air with a 30-minute time limit, and its only objective is to take down Moon 11, the X-40 Nightmare flown by Selene.[4][5] The fight has a second phase: destroying the X-40 the first time does not end the mission.[4]

The conditional enemy ace is Prudens in an Su-57 Felon. On Veteran or higher, fly under an urban highway bridge to make Prudens appear.[5][6][7]

Mission 29 at a glance

Item Mission 29
Mission name Selene[1][2][3]
Operation Lunar Eclipse[1][2][3]
Location FCU Capital: Theve[3]
In-game date April 1, 2030[3]
Focus / time limit Air-to-Air / 30 minutes (community wiki)[4]
Boss Selene, X-40 Nightmare (appears automatically)[5]
Mission medal None[1]
Story trophy The Anemone (Bronze), on any difficulty[8]
Conditional ace Prudens, Su-57 Felon (Veteran or higher)[5][6]
Comes after / before Mission 28, A Thousand Points of Light / Mission 30, Song of Wings[1]

The fight in phases

No bylined guide has written up this fight yet, so this order follows the community wiki's mission page, in our own words.[4]

  1. Phase 1: dogfight the X-40. The wiki gives the objective as shooting down the X-40 before a Tonitrus Spear strike can hit the land battleship Xanthos. Four escort UAVs fly with it. They only become targetable after a dialogue sequence, and they protect the X-40 with force fields. The wiki does not say whether you have to destroy them first.
  2. The mission updates. Destroying the X-40 does not complete the mission. Its outer wings drop off and its nose unit detaches.
  3. Phase 2: close-range finish. The game switches to a close-range assault view. Shoot down the nose unit, then destroy the laser designator, which only becomes targetable once the nose unit is gone. That completes the mission.

For what the X-40 can do as a player plane, and how to unlock it after the campaign, see X-40 Nightmare.

Targets and point values

Point values come from the community wiki's enemy list for this mission.[4] We regrouped them by phase and added the totals.

Phase Target Points each Count Points in total Mission target (TGT)?
Phase 1 X-40 "MOON 11 SELENE" 1,250 1 1,250 Yes
Phase 1 Escort UAV 300 4 1,200 No
Phase 2 X-40 nose unit 1,050 1 1,050 Yes
Phase 2 Laser designator 200 1 200 Yes
Optional Su-57 "PRUDENS" 2,020 1 2,020 No

Our calculation:

  • The standard units add up to 1,250 + 1,200 + 1,050 + 200 = 3,700 points.
  • The four escort UAVs are 1,200 of that, about 32%.
  • Prudens alone is worth 2,020 points, so triggering the ace raises the listed total to 5,720 points, about 55% more than the standard units. That fits PowerPyx's general figure of around 2,000 points for an ace kill.[9]

How to get Prudens: the steps in order

  1. Play on Veteran or higher. Named aces only spawn on Veteran difficulty or above.[1]
  2. Fly under an urban highway bridge.[5][6][7] The wiki's mission page adds that Prudens then spawns to the east.[4]
  3. Shoot down Prudens (Su-57 Felon).[5]
  4. Finish the mission. A named ace kill only saves once you complete the mission. Restarting, quitting or failing after the kill erases it.[8]

Downing a conditional ace unlocks a paint scheme for that ace's aircraft type,[5] which for Prudens is the Su-57. All aces: named aces and skins.

Missed Prudens? You can replay Mission 29 in Free Mission after your first campaign clear, on any difficulty you have unlocked.[1]

Mission 29 and S rank

  • Taking no damage adds a 5,000-point bonus. A checkpoint restart costs points.[9]
  • As of October 3, 2026, PowerPyx's Ace-difficulty S-rank walkthrough has no written route for Mission 29,[9] and the S Rank section of the wiki's mission page is empty.[4] The S-rank score is not confirmed.

More on scoring: S rank requirements.

Not confirmed yet

We found no source for these, so we do not list them:

  • A recommended aircraft or special weapon for this fight
  • Whether the escort UAVs must be destroyed before the X-40 can be hurt
  • Where exactly the qualifying bridge is
  • The S-rank score

The full mission order is on missions list and length.

Sources & References

  1. KeenGamer: ACE COMBAT 8: WINGS OF THEVE – All Missions List (Rafly Wibowo, Sep 29, 2026) ↩ 1, 2, 3, 4, 5, 6, 7, 8
  2. The Click: ACE COMBAT 8 Mission List (PaulD, Sep 30, 2026) ↩ 1, 2, 3
  3. Ace Combat Wiki (wiki.gg, community wiki): Ace Combat 8: Wings of Theve/Missions ↩ 1, 2, 3, 4, 5
  4. Ace Combat Wiki (wiki.gg, community wiki): Selene (mission) (edited Oct 2, 2026; stub page with story spoilers) ↩ 1, 2, 3, 4, 5, 6, 7
  5. PowerPyx: Ace Combat 8 All Assault Records & Enemy Aces (Jack McBastard, Sep 29, 2026) ↩ 1, 2, 3, 4, 5, 6, 7
  6. The Click: ACE COMBAT 8 Assault Records: All Enemy Aces and How to Find Them (PaulD, Sep 30, 2026) ↩ 1, 2, 3
  7. Ace Combat Wiki (wiki.gg, community wiki): Ace Combat 8: Wings of Theve/Aces (edited Oct 3, 2026) ↩ 1, 2
  8. KeenGamer: ACE COMBAT 8: WINGS OF THEVE – All Trophies List and Platinum Roadmap (Rafly Wibowo, Sep 29, 2026) ↩ 1, 2
  9. PowerPyx: Ace Combat 8 All Ace S-Ranks Walkthrough (Oct 1, 2026) ↩ 1, 2, 3
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