Ryudamon

Ryuudamon is a Dragon Digimon and a carrier of the X Antibody whose name and design are derived from the Ryū-ou (竜王) chess piece. Because it has an old-style Interface on its brow, it is presumed to be an experimental "Prototype Digimon" from before Digimon were discovered. Although its body is clad in Japanese-style armor high in defensive ability, its movements are nimble, so it fights by resolutely leaping into the opponent's chest. It studies the business of combat so that it is strong enough to fight, and possesses, with bravery and a soul that doesn't fear more powerful Digimon. The data that is said to have been hidden within the deepest parts of its DigiCore, during an experiment, is the ferocious combat data of the "Dragons" and "Generals" of Japanese mythology, and it is said it has the potential to grow into a mighty Digimon.

Digimon Battle
There is a quest where you can rent a Ryudamon or Yaamon. To keep the Ryudamon you must get it to LVL 61 and digivolve it to OuRyuumon. The quest is at Mudfrigimon village.

Digimon Masters
Ryuudamon is an obtainable mercenary digimon. It digivolves into GinRyuumon at LVL 11, HisyaRyuumon at LVL 25 and OuRyuumon at LVL 41.

Attacks
 * Kabutogaeshi (兜返し): Withstands the opponent's attacks with its armor and helmet, then counterattacks.
 * Katana Attack (居合刃): Leaps into the opponent's chest and fires a blade of iron from its mouth.
 *  BURST: Blasts the opponent with multiple explosions.