With the effectiveness of gun-only CIWS systems largely understood to be minimal, the Imperial Layarteb Navy sought a secondary system in the RIM-116 Rolling Airframe Missile. Meant to complement the Mark 15 Phalanx 20mm CIWS system, the Rolling Airframe Missile proved to be superior, in all aspects, to the Phalanx. The upgraded Phalanx II, which used a 15.5mm Gatling gun instead of the 20mm Vulcan was even less effective. Following the severe damaging of a Dnalkrad air-defense frigate off the coast of the Falkland Islands by an anti-ship Exocet missile, the Layartebian Defense Corporation sought to produce a new CIWS system that could create a combined missile/gun system, to increase effectiveness. Already in trials, the Sea RAM, which replaced the gun of the Phalanx with an 11-round RIM-116 launcher was used as one of the developmental projects. With the introduction of the Kashtan system and the Millenium Gun, new technologies and designs began available. After an extensive trial period, the Mark 205 CIWS was finally constructed and put into trials. It features a pair of powerful Mark 202 Mod 1 35 millimeter/90-caliber twin-barrel autocannons and a single 11-cell RIM-116 launcher, giving it more power than the Kashtan, a combination that the Sea RAM did not have, and much more effectiveness than the Phalanx.

Design
The Mark 205 CIWS is designed with the thinking that it will be the only thing standing between the lives of hundreds or thousands of men and certain death. As life is valued over machinery in the Imperial Layartebian Military, the Mark 205 was spared no expense in its developmental stage. The result is an automated system that can operate completely independently. It is not necessarily a large system but it is bigger than the compact Phalanx system it intends to replace. It is laid out in the way the Kashtan is with a pair of cannons on its sides with a shoulder pod for Rolling Airframe Missiles on its right side. The system is also built to allow for a very large frame of motion. It can traverse a full 360° when space permits and the system itself has an elevation range of -10° to +10° allowing for a two-axis movement. The system itself requires deck penetration due to its size and weight. The system itself weighs 25,815 lb. (11,710 kg) empty and 34,850 lb. (15,808 kg) loaded with ammunition and missiles. It is slightly heavier than the Kashtan system, which weighs 34,172 lb. (15,500 kg) loaded. The Mark 205 CIWS includes its own sensor systems as well as an independent gas operating system to enable quicker spin-up time for the autocannons. Where timing is everything, the gas-operation system allows for much quicker spin-up time for the cannons than if they were electrically powered. The system can train at a rate of 115° per second, the same speed afforded to the Phalanx, which gives it a distinct advantage over such systems as the Kashtan. Though much heavier, this is accomplished through heavy-duty gyros and motion systems. However, the Mark 205 does have another added feature. Like the Millenium Gun, it has a quick instant velocity rate, allowing instantaneous acceleration of 145° per second. The system can elevate at a rate of 65° per second with an instantaneous acceleration rate of 85° per second.

The electrical power requirements are 600 V AC at 60 Hz. Like the Phalanx, the system uses chilled seawater for its electronics cooling. Also, like the Phalanx, it has inputs for true compass ship's heading.

Fire Control
The fire control system of the Mark 205 is developed from the Phalanx system but heavily improved. Designed to be fully automated and independent, the system can track and categorize as many as 45 targets thanks to its multiple sensors, which include an electro-optical sensor for backup, an infrared search & track system, and uses a LADAR for its primary detection means. It uses a variety of methods to detect incoming threats that include surface and aerial contacts. Modified for all-weather operation, the system has a target classification system similar to that of the Phalanx. Contacts are first analyzed for their heading. If a target is not heading towards the ship, it is discarded like the Phalanx did. Then, like the Phalanx, it determines if the contact is actually heading to attack the ship. Based on the heading and speed of the ship and the missile, the computer plots a course for both and determines if there will be an impact point. If not, the system can discard the missile. This can be overridden manually if the threat comes close enough to be a possible threat, which is highly useful against nuclear munitions. However, unlike the Phalanx, there is an even larger minimum and maximum velocity envelope. There is, in essence, no upper limit to the speed of an incoming threat, useful for keeping hypersonic contacts in the database. Minimum speeds are adjusted to include slower traveling surface craft.

The system is designed to detect threats out as far as 25.00 mi (40.25 km), track them as far out as 15.50 mi (25.00 km). The system can be linked into the main sensor system of the ship, allowing for longer-range detection, although it cannot operate until the threat comes within this engagement envelope. The system does contain an IFF database that is coordinated with that of the ship itself. Though highly immune to electronic jamming, the system contains the backup EO system, which can see as far as the limits of the horizon and a powerful IRST system, which allows for excellent short-range detection. It also allows for added all-weather capabilities and incorporates a laser-rangefinder for full fire control solutions. If the LADAR becomes inoperable, the IRST can operate the system as effectively.

Weapons
The Mark 205 would be nothing without its weapons. It features both cannons and missiles, which combine the best of both worlds. Missiles provide the longer-range and higher accuracy fire required, especially against hypersonic missiles and potent threats that are jinking. They can also be used against aircraft as well, providing point-defense for the ship. Its cannons, on the other hand, provide a more numerous solution and are highly effective against subsonic missiles. They can also be used highly effectively against aircraft. The system combines an 11-round missile pod with a pair of twin autocannons, giving more available firepower than either the Kashtan, the Goalkeeper, or the Phalanx.

The cannon armament of the Mark 205 is made up of a pair of Mark 202 Mod 1 Stinger autocannons. Gas-operated, electrically fired, these autocannons operate on the Gast principle. They are based on heavily on the 2A38M 30 mm cannons used on the 2S6M Tunguska, which are 30mm twin autocannons that have a rate of fire equal to 4,800 rounds per minute between the two of them. The Mark 202 Mod 1 Stinger autocannons use the 35x228mm round, heavier and more powerful than the 30x165mm round used by the Tunguska and 30x173mm round used by the Goalkeeper. It is significantly more powerful than the 20x102mm round used by the Phalanx. Each Mark 202 Mod 1 Stinger mounts a pair of 90-caliber barrels that can fire up to 2,500 rounds per minute. Combined, they offer up to 5,000 rounds per minute. While only half the rate of fire offered by the Kashtan, there are a number of advantages. It does offer a higher rate of fire over both the Goalkeeper and the Phalanx. However, because the Mark 202 Mod 1 Stinger is not a Gatling gun, it does not have the problem of round dispersion that all three of these other systems suffer from, especially the Kashtan. While the Mark 202 Mod 1 Stinger has a lower rate of fire than the Kashtan, it can put far more rounds on target accurately than any Gatling gun system. In addition, because it is an autocannon and gas-operated, it can spin up to its full rate of fire much more quickly than any Gatling gun system can. This is crucial when engagements may only last a few seconds.

The Mark 202 Mod 1 Stinger autocannons are capable of the full traverse of the Mark 205 and can elevate between -15° and +85° by themselves. When combined with the elevation abilities of the mount, its funn range of elevation is between -25° and +95° giving it a larger elevation range than any other CIWS system. The guns themselves can elevate at 130° per second with an instanteous acceleration rate of 160° per second. Each autocannon is fed by two drums of 500 rounds each. The system can fire a full range of AP, HE, FAPDS, and AHEAD rounds and the rounds can be mixed within its drums but by and large it is loaded with AHEAD anti-missile rounds. Firing at full speed under constant duration, the Mark 202 Mod 1 Stinger can empty its 2,000 rounds in under 25 seconds firing at 83 rounds per second. In contrast, the Kashtan can empty its 1,000 round magazine in under 7 seconds firing at 166 rounds per second. The advantage to the Mark 202 Mod 1 Stinger is less reloading, better probability of a hit, and less dispersion.

The muzzle velocity for the Mark 202 Mod 1 Stinger autocannon is very high, which allows it for a longer range than most guns in its class. It can fire HE rounds at a speed of 3,855 fps (1,175 m/s), FAPDS rounds at a speed of 4,724 fps (1,440 m/s), and AP and AHEAD rounds at a speed of 3,445 fps (1,050 m/s). Its effective range is 3.42 mi (5,500 m) slant range with a maximum ceiling of 13,123 ft. (4,000 m).

The missile armament of the Mark 205 is the RIM-116 Rolling Aiframe Missile and the system carries eleven missiles. The current missile is the RIM-116D Rolling Airframe Missile. It is an improvement over the RIM-116C missile, which was larger and better equipped than either the RIM-116A or RIM-116B variants. Each RIM-116D weighs in at 188.00 lb. (85.28 kg), which is 26.00 lb. (11.79 kg) heavier than the A and B versions and 18.00 lb. (8.16 kg) heavier than the C version. Each missile is 9.25 ft. (2.82 m) long, 5.75 in (146.05 mm) in diameter, and are equipped with the same 25.00 lb. (11.34 kg) warhead as its previous versions. The blast fragmentation warhead is the same used in the AIM-9X Sidewinder. Stabilized by rolling through the air, the RIM-116D is equipped with a gel-fueled rocket motor and sustainer with thrust vectoring nozzles. Each RIM-116D is guided by a 105° imaging infrared seeker that is also equipped with a passive radio sensor, which can home in on the radar emissions of an enemy missile. Like the previous versions, there are various guidance modes. In the first, the IIR mode is only used against threats that do not emit detectable RF radiation whereas the passive radio is used if there is detectable RF radiation. There is a third mode that enables IIR guidance the entire way to the target. It also features the same IRDM (dual mode) guidance used on the previous versions, enabling launch in IIR guidance but switching over to passive radio when the RF emissions are detectable. The missile has a maximum speed of Mach 2.80 at sea level and can accelerate at +60G's. Its engagement envelop is between 0.25 miles (402.34 m) and 12.50 miles (20.12 km). Its maximum ceiling is 26,250 ft. (8,000 m) and has a pK against 0.965 against missiles and over 0.98 against aircraft. It offers 100% more range, a 26% heavier warhead, 128% more altitude, and slightly more speed than the SA-N-11 Grison missile used on the Kashtan. However, it is larger and nearly 50% heavier.

The RIM-116 pod is independently moved from the gun systems. It can elevate between -10° and +90° by itself, which allows for -20° and +100° when the tilt is in motion on the base system. Missiles are electrically fired and optimized for anti-missile use but are highly efficient and effective against maneuvering aircraft, able to manuever against aircraft pulling as many as +10Gs. They are fired on a direct line to the target path and do not contain any lofting parameters.

Costs
Each Mark 205 system costs approximately $25,000,000.00 by itself. Each RIM-116D Rolling Airframe missile costs an additional $600,000.00. When dealing with export situations, the RIM-116C Rolling Airframe Missile is exported at a price of $550,000.00. With its full cannon and missile load, the system can cost up to $7,000,000.00 more. The system does require deck penetration but is meant to work in the same base print of the Phalanx. However, its overall size is larger than that of the Phalanx.