"Oh my g...! It just stopped in mid-air!"
― An Aurelian Air Force fighter pilot commenting on the Fenrir's extraordinary flight patterns

The XFA-33 Fenrir (or simply Fenrir on the handheld games) is an original next-generation combat aircraft developed by Leasath in the Strangereal universe. It made its first console appearance in Ace Combat Infinity, previously debuting on the handheld Ace Combat X: Skies of Deception and Ace Combat: Joint Assault.


The aircraft is named after a mythical wolf from Norse mythology, and the son of Loki. Odin's son, Víðarr, slays Fenrir in battle. This is referred in the Ace Combat X medal "The Mark of Vioarr", earned by completing either "End of Deception I" or "End of Deception II".



The Fenrir is known for its large airframe. The Fenrir's wings utilize a polyhedral cropped delta configuration with bent wingtips, a V-tail, canards, and dual air intakes. The frontal landing gear is housed within the mouth-like pod beneath the cockpit. The Fenrir uses dual thrust vectoring engines, aided by a smaller power plant between both, which give it VTOL capabilities.[1]


The aircraft uses Connection for Flight Interface hardware for control. The cockpit features a dashboard with a digital interface that displays vital information of the aircraft, along with a 3D render of Fenrir. Depending on the game, this 3D render acts as a compass (Ace Combat X and Infinity) or to show the aircraft's position in a virtual space (Joint Assault).

The Fenrir was primarily designed to operate as a testbed for experimental military technologies researched in Leasath, including a downsized and improved version of the optical camouflage system used by the Gleipnir. The Fenrir's improved camouflage system also reduced its engine noise, further improving its stealth capabilities.[1] Unlike the Gleipnir, the Fenrir's optical camouflage system required a ground-based energy emitter to function. It retained the vulnerability of malfunctioning from damage feedback and, if the Fenrir suffered critical structural damage, would be disabled entirely.


Fenrir's main weapons consist of dual autocannons and short-range missiles. Fenrir could be additionally equipped with special air-to-air and air-to-surface missiles, as well as a small-scale version of the Gleipnir's SWBM.

Leasath also developed a new microwave weapon to equip onto the Fenrir units. The system functioned through the intersection of microwave energy beams generated by a nearby ground station and the Fenrir itself, creating a ball of high-intensity microwave energy that homed in on the engines of enemy aircraft. The energy would overheat the engines and fuel systems, eventually causing the target aircraft to explode.




Leasath created Fenrir under Diego Navarro's instructions following the destruction of the Gleipnir over Santa Elva. The aircraft was created using battle data acquired by the airborne fortress.[2] The aircraft's production and development was held at Sentry Island, within Archelon Fortress.[3]


Following Fenrir's completion, Navarro contacted the elite Alect Squadron to pilot 4 of the finished units. The squadron would reach Archelon Fortress via the Danern Straits. Additionally, a new weapon, the High-Powered Microwave, was also being developed and transported for use by the aircraft.[4]

Navarro also planned to unveil Fenrir in Alendal, Leasath's capital city.[5]

While the Alect Squadron successfully reached the stronghold, the HPM was destroyed while it was being transported from Cobalt Cave.[6]

Once the Aurelian Air Force's Gryphus and Aquila Squadron had reached Sentry Island, Alect Squadron, now piloting Fenrir, quickly took off. In a hectic dogfight, all Alect pilots were shot down. However, another Fenrir, holding valuable data from the battle, was taking off from within Archelon Fortress but was quickly shot down by Gryphus One. The fortress was soon engulfed in flames.[7]

Destroyed Fenrir

The shattered Fenrir in Alendal

With the destruction of the fortress and the Fenrirs playing live at Navarro's unveiling event, the citizens watching the live broadcast became outraged. They stormed in on him and destroyed the Fenrir model that was presented in the stadium.[8]


After the war, much of the intact remains were retrieved from the ruins to be inspected by Aurelian engineers. It was then reproduced for research purposes, without the VTOL and optical camouflage systems, resulting in lighter airframes with more maneuverability.[1][3]

Infinity universe[]

Details of the XFA-33 Fenrir's creation are scarce. All that is known is that it was developed by a small country in the Southern Hemisphere, for the purpose of showcasing the advanced technologies of their military-industrial complex. However, after the fortress which served as the XFA-33's development facility was destroyed, another nation retrieved the aircraft's remains and reproduced it.[9]

Later, Wernher and Noah Enterprises came to possess the designs and used their Advanced Automated Aviation Plant to reproduce it and make it available to mercenaries worldwide, where it found limited success.[10]

Game Analysis[]

Ace Combat Infinity[]

"A large-scale special attacker aircraft developed by a small country in the southern hemisphere. It was originally created as a demonstration aircraft to display the high-level technical capabilities of a military-industrial complex, but the fortress which acted as a base for the aircraft's development and production was destroyed. A certain country discovered the remains of the aircraft and reproduced it for research. Unlike the prototype aircraft, it doesn't come equipped with optical camouflage or VTOL systems, but it's lighter and features improved maneuverability, resulting in an aircraft that is more suitable for real combat."

How to Unlock

The Fenrir is available through the Aircraft Tree.
1 825 4,590,000 520 136 14 C+ C+ B B C+ D+
2 874 2,727,000 590 138 16 B C+ B B C+ C
3 923 3,942,000 660 140 18 B+ B B+ B B C+
4 972 4,644,000 730 142 20 40 A B+ B+ B+ B B
5 1021 7,047,000 800 144 22 44 A+ B+ A A B B+
6 1070 14,850,000[a] 856 146 24 48 A+ A A A B+ A
7 1119 7,290,000 912 148 26 52 3 A+ A A A B+ A+
8 1168 8,100,000 968 150 28 56 3 S A+ A+ A A S
9 1217 8,910,000 1024 152 29 60 4 S S A+ A+ A S+
10 1266 9,990,000 1080 154 30 64 4 S+ S A+ A+ A S+
11 1317 11,070,000 1136 158 31 66 5 S+ S+ S A+ A S+
12 1368 12,690,000 1192 162 32 68 5 S+ S+ S A+ A+ S+
13 1419 13,500,000 1248 166 33 70 6 S+ S+ S S A+ S++
14 1470 15,525,000 1304 170 34 72 6 S+ S+ S+ S A+ S++
15 1521 17,010,000 1360 174 36 76 7 S+ S+ S+ S A+ S++
16 1591 22,464,000 1416 176 37 78 8 S++ S+ S+ S S S++
17 1654 25,650,000 1472 178 38 80 8 S++ S+ S+ S+ S S++
18 1717 28,863,000 1528 180 39 82 9 S++ S+ S+ S+ S S+++
19 1780 36,882,000 1584 182 40 84 9 S++ S++ S+ S+ S S+++
20 1843 46,521,000 1640 184 42 88 10 S++ S++ S+ S+ S+ S+++
Part Slots
At Lv.1, this aircraft carried 36 BODY, 36 ARMS, and 36 MISC part slots. See Tuning § Slot Expansion for further information.
Upgrading this aircraft to these levels unlocked the respective nicknames for use at any time.
  • Lv.3: Wolfpack
  • Lv.10: World Eater
  • Lv.15: Twilight of the Gods
  • Lv.20: Lone Wolf

Skin Galleries


Air superiority gray camouflage


XFA-33 Event Skin -01


Desert brown body with with black trim and nose; based on the Special 2 color from Ace Combat X: Skies of Deception



Ace Combat: Joint Assault[]

"A special attacker with mysterious capabilities and amazing maneuverability."

How to Unlock

Complete Reprisal (21A) on Ace difficulty on or after a second campaign playthrough. Costs $824,000.[11]


Speed: 80
Air-to-Air: 65
Air-to-Ground: 65
Mobility: 65
Stability: 70
Defense: 70


  • STDM x150
  • HACM x100, costs $13,500
  • LGWM x200, costs $16,800
  • HVWM x50, costs $20,000
  • LASM x15
  • XMAA x32, costs $106,000
  • SFFS x24, costs $42,500
  • LSWM x4, costs $202,000


  • Color 01: Light grey
    • Default
  • Color 02: Alect Squadron livery; black with white accent
  • Color 03: Blue livery
    • Unlock: Earn 42,400 cumulative points with the Fenrir (40% of Kill Rate Gauge)[12]
  • Color 04: Desert brown body with black trim and nose
    • Unlock: Earn 63,600 cumulative points with the Fenrir (60% of Kill Rate Gauge)[12]
  • Color 05: God Eater collaboration theme
    • Unlock: Earn 84,800 cumulative points with the Fenrir (80% of Kill Rate Gauge)[12]
  • Color 06: Ocean livery
    • Unlock: Earn 106,000 cumulative points with the Fenrir (100% of Kill Rate Gauge)[12]

Named Pilots


Ace Combat X: Skies of Deception[]

"An advanced fighter developed using tactical battle data gathered on the Gleipnir."
"A special attacker aircraft developed by Diego Navarro as the Leasath Army's trump card. Equipped with an optical camouflage system that was further developed from the Gleipnir, it was able to disappear and mask its noise. However, this model was rebuilt for research purposes based on the remnants of Archelon Fortress that the Aurelian Army destroyed. Because of this, the optical camouflage and VTOL systems were not reproduced, but its weight has been reduced and it features improved maneuverability."
Ace Combat X: Skies of Deception - The Complete Guide

How to Unlock

Complete the campaign on Ace difficulty and complete Operation X. Costs 215,000 credits.[1]


ACX Statistics Fenrir


  • GUN x800 (∞ on Easy and Normal)
  • MSSL x50 (x75 on Easy)
  • LASM x18
  • XMAA x22, costs 100,300 credits
  • LSWM x2, costs 129,000 credits

Named Pilots


  • Aurelia: Plain gray
    • Default
  • Leasath: Alect Squadron livery; solid black with white wing/stabilizer accent
  • Special 1: Dark blue
    • Unlock: Earn an S rank on Operation X on Ace difficulty[1]
  • Special 2: Desert brown with gray nose and body trim
    • Unlock: Earn 80,000 points with the Fenrir[1]



  • The Fenrir bears a resemblance to the Super Sylph B-503 from Sentō Yōsei Yukikaze. This similarity is specially notable in the design of the wings and the mouth-like protrusion beneath the Fenrir's nose.
  • The escaping Fenrir and the rest of prototype (labeled "Unknown") in Mission 15B were painted with Special 2 livery
  • One of Bandai Namco's other franchises, God Eater, features an organization called "Fenrir", sharing its name with the Ace Combat aircraft. Fittingly enough, the Fenrir has an unlockable God Eater-themed collaboration livery in Joint Assault. As well, a Fenrir emblem was available to all players during a God Eater-themed Collaboration Event in Infinity.
  • In early concept art, the F-3 Shinden II used a similar wing configuration to the Fenrir.
  • Unlike many other aircraft, the plane initially did not have an official designation, only being listed with its nickname, "Fenrir". The designation was revealed in Infinity, which labelled the aircraft as "XFA-33".

See also[]


  1. Players could use one Nonstandard Upgrade Request Form instead of credits for the Lv.6 upgrade.


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Ace Combat X: Skies of Deception - The Complete Guide, page 210.
  2. Fenrir hangar description. Ace Combat X: Skies of Deception.
  3. 3.0 3.1 XFA-33 Fenrir hangar description. Ace Combat Infinity.
  4. Cutscene following Wild Card. Ace Combat X: Skies of Deception.
  5. Cutscene prior to End of Deception II. Ace Combat X: Skies of Deception.
  6. Fire Storm. Ace Combat X: Skies of Deception.
  7. End of Deception II. Ace Combat X: Skies of Deception.
  8. Cutscene following End of Deception II. Ace Combat X: Skies of Deception.
  9. XFA-33 Fenrir description, Ace Combat Infinity.
  10. Ace Combat Infinity
  11. 11.0 11.1 Ace Combat: Joint Assault Perfect Guidebook, page 142.
  12. 12.0 12.1 12.2 12.3 12.4 Ace Combat: Joint Assault Perfect Guidebook, page 149.