|This article is about a/an mirror monster in Kamen Rider Ryuki.|
Metalgelas (メタルゲラス Metarugerasu) is a Mirror Monster that was originally contracted to Kamen Rider Gai but was later contracted to Kamen Rider Ouja. This makes him one of 5 Mirror Monsters that had more than 1 contractor. Together with Venosnaker and Evildiver, it became one of the building blocks of the composite Monster Genocider.
Metalgelas appears initially as Gai's Contract Monster but after Jun is killed, Asakura contracts him. Metalgelas resembles a humanoid rhinoceros and can reach extremely high speeds. He also has tough skin that can crush a moving car.
Metalgelas originally assisted Jun in both destroying monsters and attacking other Riders. However, once Jun died at the hands of Asakura, Metalgelas attacked many people whom it believed resembled Asakura (as it was trying to avenge its contractor). However, Asakura was able to successfully contract Metalgelas and after Asakura obtained Evildiver as well, he was able to merge Metalgelas with Evildiver and Venosnaker to create Genocider.
Metalgelas began to once again turn on Asakura after he neglected to feed it life-force energy from Mirror Monsters. In defiance, he attacked Asakura once before finally being fed just before Asakura completely breached his contract.
As Asakura didn't die at the hands of a Rider, it's not known what happened to Metalgelas. However, the End implies that because the Rider War was made non-existant, Metalgelas was also made non-existent.
Metalgelas makes a brief appearance in the film. He appeared when Asakura used his Unite Vent card to combine Metalgelas with Evildiver and Venosnaker into Genocider. Metalgelas was also destroyed alongside Evildiver and Venosnaker when they were hit by Kamen Rider Ryuga's Final Vent.
Metalgelas was also one of the kaijin who gather at Eiji Hino, Kotaro Nogami and Ankh/Momotaros' public execution. However, when all Kamen Riders return to existence, Metalgelas tries to attack them although it's foiled by Kamen Rider Black RX.
Metalgelas was among one of many Mirror Monsters brought over to Sougo Tokiwa's world as the Rider Worlds began to merge.
- Height: 235 cm
- Weight: 270 kg
Metalgelas' claws Metalnail (メタルネール Meta Neiru) are the sturdiest part and can be used in combat other than its horn.
- Heavy Pressure (ヘビープレッシャー Hebī Puresshā): Equips Gai (or Ouja) with the Metalhorn if the user does not already possess it. Gai/Ouja next grabs onto Metalgelas' head with his legs and points the Metalhorn in front of him. Metalgelas then runs into the enemy, resulting in Gai/Ouja striking it with the Metalhorn.
Through the use of certain Advent Cards, parts of Metalgelas' body can be used by Gai or Ouja as weapons or other equipment.
- Metalhorn (メタルホーン Metaru Hōn): A gauntlet derived from Metalgelas' head. It is summoned by Gai's/Ouja's Strike Vent card.
- Metalgelas derives its name from the Greek river god Gelas. Although many depictions of Gelas are that of a bull-horned man, some contexts refer to it as "head of horns".
- The word Gelas also means mirrors and glass in Malay Language and Indonesian language as Metalgelas is a mirror monster.