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The YMS-15E Gyan Eos is a variant of the YMS-15 Gyan featured in MSV-R as well as MSV-R: The Return of Johnny Ridden manga series.

Technology & Combat Characteristics

A modified version of the original YMS-15 Gyan jointly created by Zeonic and Zimmad, the Gyan Eos, named after the Greek goddess of dawn, was intended to be more suitable for actual combat. In order to improve its mobility in space, it was fitted with the same type of backpack as the MS-14B Gelgoog High Mobility Type. For increased firepower, it was armed with a prototype beam bayonet. It also featured a new shield.[1] Despite being modified for combat, its colors and decorations suggested that it was designed not only for battle, but also for ceremonial purposes. Due to its name, it was nicknamed "Knight of Dawn" by mobile suit pilots.[1]


  • Shield
The Gyan Eos' shield omitted the missile launchers of the original Gyan's shield, increasing its defensive capability in close combat. It was also made of new armor materials.[2]
  • Beam Bayonet
An experimental, bayonet-type weapon designed for mid-close range combat. It has a beam sword generator at the tip and a small beam gun further down. Compared to the Gelgoog's beam rifle, it has lower power and a shorter range.[2]
  • 360mm Giant Bazooka
The same bazooka used by the MS-09B Dom, it was used by the Federation Survey Service's refitted unit.


During the second phase main force mobile suit selection, the YMS-15 Gyan was defeated by the MS-14 Gelgoog. As such, only three prototype units were manufactured: one of them was assigned to Colonel M'Quve, while the other two were assigned to the Mobile Assault Force led by Kycilia Zabi.[3] With the assistance of Zimmad and Zeonic, the Mobile Assault Force modified its two units for actual combat.[3] The modified units were named "Gyan Eos" and given the new model number of YMS-15E. They were assigned to the Mobile Assault Force's flagship protection unit.[1] The mass production of YMS-15E was considered, but ultimately did not come to fruition.[2]

In December, U.C. 0079, the two units were unveiled to the Zeon public at Zum City as the Principality forces' latest mobile suit model during a speech by military officials. Both units were piloted, and it was considered unusual to unveil mobile suits at the capital, leading to the rumor that this was actually a precautionary measure against potential terrorist attacks.[1] There were records of the Gyan Eos participating in combat during the Battle of A Baoa Qu and shooting down a RGM-79SC GM Sniper Custom.[1] In addition, during the Battle of Solomon, two units belonging to Degwin Sodo Zabi's royal guard stopped the duel between Shin Matsunaga and Johnny Ridden in Side 3.[4]

In U.C. 0090, a unit belonging to the Federation Survey Service was piloted by Uma Lightning during the search for the Zanzibar-class mobile cruiser Sangre Azul. This unit was refitted with a panoramic cockpit and a linear seat.



  1. 1.0 1.1 1.2 1.3 1.4 Gundam Ace April 2013, p.570-571
  2. 2.0 2.1 2.2 Gundam Ace April 2013, p.573
  3. 3.0 3.1 MSV-R: Zeon Edition (2014), p.24-25
  4. MSV-R: Shin Matsunaga, Fabulous-J045

MSV-R Mechanics
Earth Federation
Mobile Weapon
Full Armor Gundam's variations
FA-78-1B Full Armor Gundam Type B | FA-78[G] Full Armor Gundam Ground Type
Heavy Gundam's variation
FA-78-2 Heavy Gundam (Unit 2)
GM Cannon's variations
RGC-80-1 GM Cannon Test Type | RGC-80S GM Cannon Space Assault Type
GM Sniper Custom's variations
RGM-79HC GM Guard Custom | RGM-79KC GM Interceptor Custom | RGM-79SC GM Sniper Custom (Shimoda Squad Type)
GM's variations
RGM-79LV GM Night Seeker II | RGM-79U GM Sloep | RGM-79V GM Night Seeker
Guntank's variation
RMV-3M Local Control Type Guntank
Guncannon's variation
RX-77-3D Guncannon Heavy Arms Type D
Gundam's variation
RX-78-2 Gundam Real Type | RX-78SP Gunner Gundam
Ball's variations
RB-79F Ball Type F | RB-79M Ball Type M

Aircraft / Spacecraft
FF-S5 Raven Sword | FF-X5 Prototype Core Fighter | FF-X7BstPLAN004 Core Booster Plan004 | G-Fighter Assault Landing Type | G-Fighter Bomber Type | G-Fighter Space Type
Transporter / Supply Ship
CB-X5(SGT) Assault Type Gunperry
Cruiser / Mother Ship
SCV-102 Nelson
Principality of Zeon
Mobile Weapon
Agg's variation
EMS-05F Azock
Zaku I's variation
MS-05Q Zaku I (Norris Custom)
Zaku II's variations
MS-06A Zaku II First Mass Production Type | MS-06FS Zaku II | MS-06R-1A Zaku II High Mobility Type | MS-06S Zaku II Commander Type
Zaku II Ground Type's variations
MS-06D Zaku Desert Type | MS-06G Zaku II High Mobility Ground Type | MS-06GR Zaku II High Mobility Ground Type Kai | MS-06JK Zaku Half Cannon | MS-06K Zaku Cannon (Gatling Gun Equipment Type) | MS-06V-8 Zaku Tank (Wild Boar)
Gouf's variations
MS-07G-1 Gouf Vijayanta | MS-07G-2 Gouf Tactical Assault Type | MS-07W Gouf Combined Test Type
Dom's variations
MS-09 Dom Cold Climate Type | MS-09M Dom Mermaid | MS-09R Rick Dom Dozle Zabi Custom | YMS-09J Dom High Speed Experimental Type
Gelgoog's variations
MS-14B Gelgoog Uma Lightning Custom | MS-14BR Gelgoog High Mobility R type | MS-14C-1A Gelgoog Cannon | MS-14GD Gelgoog G
Z'Gok's variation
MSM-07N Ram Z’Gok
Gyan's variation
YMS-15E Gyan Eos
Bigro's variation
MA-05R Big Ruf
Grublo's variation
MAM-07-X3 Grublo Underwater Bit-Mounted Prototype
Zakrello's variation
MAN-00X-2 Brawrello
MSM-06 Jurick

Aircraft / Spacecraft
Dodai GA | G87 Luna Tank | Gobble
Cruiser / Mother Ship
CCM-91 Chimaira | Gagaul-class