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Welcome to the underworld.
—The Irkalla before "singing" the deaths of her enemies

The Aerial Fortress Irkalla is the epic unit of Epsilon Headquarters, acting as a "one-man army" capable of single-handedly annihilating ground and air targets alike.

Official description

When Yuri was informed about the possibility of his enemies constructing gargantuan weapons in secret, for the first time in his life he felt like his grasp for world domination could be legitimately challenged. An autonomous mechanical monstrosity packed with incredible firepower, as well as potential immunity to mind control could prove to be the Epsilon’s undoing. Therefore, deep within the bowels of the Epsilon Headquarters' hangars, a weapon of unimaginable proportions was being built - capable of not only providing the Headquarters with massive firepower support, but guarding Yuri’s ultimate weapon as well.

Since its devastating sudden first appearance, the flying war machine codenamed 'Irkalla' has become a symbol of Yuri’s utter dominance over his enemies. Practically, the Aerial Fortress Irkalla is the Epsilon’s ace in the hole: capable of engaging multiple targets in the air with its numerous dissolver beams, and lay waste upon ground targets, not just with the beams alone but also with three powerful 'Supernova'-type long range cannons. Since its initial deployment, much to the Allies' and the Soviets' horror, many more of these flying machines have been sighted, resulting in an exhausting battle on every encounter.[1]


The Aerial Fortress Irkalla is the pride and joy of Epsilon Headquarters. This airborne behemoth acts as their ultimate ace in the hole - armed with six Dissolver Beams and a trio of Supernova Cannons, the mere appearance of this flying citadel will absolutely guarantee casualties for hostilities once it is within firing range.

This floating fortress's main purpose is to act as an extremely powerful and heavily-armored unit that can both defend a Headquarters base (with the appropriate support) while performing most of the heavy lifting with its obscenely high levels of firepower or as a supporting unit (albeit an overkill one) for an HQ attack force. It boasts incredible armor that is possibly among one of the best in the game, while its massive array of Dissolver Beams and Supernova Cannons will ensure nothing will survive under its prolonged onslaught. Both of these advantages allow the Irkalla to singlehandedly wipe out entire bases and attack forces on its own if there are not enough anti-air weapons to counter it. Though it is an abysmally slow unit, this isn't exactly a drawback as Epsilon HQ's main strategy mainly involves a slow and steady approach with the majority of their armored vehicles and heavier infantry.

The Irkalla generally makes a Headquarters army and/or base an incredibly difficult feat to destroy once it is deployed, as its weapons are able to eliminate any unit on the battlefield swiftly, whether it be infantry, vehicle, or aircraft. While it is possible to outrun this flying titan with faster units or fool it with infiltrators and rogue stealth units, the Irkalla shares little weaknesses with the other epic units in the game. Due to the range and insane rate of fire for both of its weapons, the ability to engage multiple targets at once, as well as their Supernova projectiles' tendency to pursue enemy forces until they finally hit their targets, makes this epic unit one of the most, if not the most effective one-unit defender that does not have the ridiculous power consumption or the inability to defend against air threats of the Plasmerizer, or the need for auxiliary support and an infantry garrison to make the Centurion Siege Crawler more suitable for base defense work.

The Irkalla is not a guaranteed game over for its opponents however. The high cost and tech requirement meant that HQ's enemies wouldn't have to worry about an oncoming presence of this unit until Epsilon HQ has reached Tier 3. Even if said subfaction is able to construct an Aerial Fortress Irkalla, wary opponents should have already amassed a large amount of forces with heavy anti-air support at the ready by the time the Irkalla reaches the enemy base. Combined with the fortress's slow Supernova projectiles and its own speed, it is possible to overwhelm an Irkalla with sheer force even if mass casualties will be an expected outcome for HQ's opponents. While the Irkalla is dreadfully effective against structures also, it is still not recommended to send it into defense lines with plenty of anti-air defensive structures as the Irkalla's weapons cannot outrage stationary AA defenses, and they can and will shoot one down before the Irkalla can safely eliminate all of them. Considering its slow speed to the point where even infantry can out-walk it, it will not be able to escape from massed anti-air fire if caught up in any of them.

It is also worth noting that the Irkalla is unable to use its Supernova Cannons against air units, which means Thor Gunships, Alanqa Skystations or just plenty of anti-air aerial units are capable of destroying an Irkalla without suffering as much casualties as land troops doing the same.

Weapon stages

Though hardly noticeable because of the rapid firing rate, the Irkalla follows a specific pattern when firing. The exact order is the following:

  • Dissolver beam
  • Supernova (x4)
  • Repeat cycle.

As mentioned before, the Irkalla will not fire the Supernova Cannon when attacking air units.

AI behavior

Irkalla controlled by the AI have the following attack patterns:

All difficulties

  • 1x guarding Epsilon Construction Yard


  • 1x targeting structures


The Irkalla at our HQ are not as refined as the one deployed in London, but still powerful.
—Epsilon intel during Operation: Unthinkable

In the Act Two finales, some Irkallas, referred to as a "Heavy Type" according to internal code in Fatal Impact, boast a shield that greatly increase their durability, but are otherwise the same.

Act Two

The first Irkalla appears in this mission where it is chronoshifted, carrying a group of elite Initiates , Archers and Epsilon Elites, into the European Alliance's fortress-city of London to cause destruction as it makes its way to the SteinsTech Hangar. It is destroyed when the Paradox Engine makes its escape.

The first objective of this mission involves using Chitzkoi (who has been upgraded with Chinese tech) to capture an inactive Irkalla so the Psychic Dominator in the area could be destroyed. Once Chitzkoi enters the Irkalla, it will be called Chitzkalla and fall under control of the player, using Chitzkoi's voiceset. The Irkalla must not be destroyed until the Psychic Dominator is destroyed.

  • See: Meltdown

  • After the Paradox Engine arrives with a wing of Thor Gunships, the enemy Epsilon forces will send an Irkalla and an air armada against them, to predictable results.

  • See: Insomnia

  • One Irkalla is initially given to the player, and another one later in the mission.

  • See: Unthinkable

  • Several Irkallas guard their respective Epsilon strongholds, and some of them will be sent to ambush the player's bases, especially when an outer Spatha Defense System is destroyed. Notably, the Irkallas deep in the fortress are of the Heavy variant.

  • See: Fatal Impact

  • An Irkalla will attack player-controlled Bommerang regiment units in the early stage. Not only so, more Irkallas will be used to defend Epsilon HQ bases or attack player's base, amount depends on difficulty.

  • See: Withershins

  • An elite Aerial Fortress Irkalla will guard Rahn's base of operations in Stage I. Later on, two elite Irkallas with escorts will arrive as reinforcements for Stage III. All three will become controllable onwards if they are not destroyed. Lastly, depending on the difficulty, a certain number of Irkallas are part of the controllable elite squadron in Stage VI if they were still active during Stage IV.

  • See: Babel

  • One of the Irkallas protects the reconstructed Epsilon airbase that must be destroyed. Unlike in Babel, all Irkallas on this mission are the Heavy variant, resulting in higher hit points than the Babel counterpart.

  • See: Hamartia

  • Special Ops

    • In Parasomnia, the second phase of the mission begins with the Epsilon surprising an Allied fleet by submerging an Irkalla underwater, but it is destroyed afterwards. More will spawn from the Dybbuk Hive after Allied forces make landfall.


    • In the Ascension Challenge, the Irkalla can turn enemy infantry into Brutes like Rahn does. Immediately after the game begins, an Irkalla will spawn from the top edge and head towards the challengers' starting point. Afterwards, two Irkallas each are a part of the Headquarters' Golden Armada, accompanied by 12 Basilisks and 7 Salamanders, all of them appearing from the central point on the top edge of the map, then proceed towards the south where the players' bases are located. Each of the Master Spires that can be destroyed in order to delay the Golden Armada is also guarded by an Irkalla.


    • Formidable flying fortress with enormous firepower.
    • Can attack both air and ground units.
    • Fires weapons at a rapid and continuous rate.
    • Capable of engaging multiple targets simultaneously.
    • Very heavily armored.
    • Immune to Blasticade and confusion rays.
    • Can self-repair.
    • Only one may be built at a time.
    • Extremely slow-moving.
    • Extremely expensive.
    • Can still be overwhelmed and focus fired if not well protected by escorts.
    • Very big, noticeable target.
    • Like the Basilisk, it cannot outrange stationary AA defenses.

    Behind the scenes

    • Prior to version 3.3.5, there were two infamous inconsistencies in Irkalla's introduction. One was that Irkalla's invention was influenced by gathered intel about the Centurion Siege Crawler, which appears later (Thread of Dread) than Irkalla (Godsend); the other one was "Since its deployment, no Allied or Soviet force alone has been able to set foot on Antarctica". This statement was obviously inconsistent with the actual situation (Insomnia).


    External links