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Dryoid (Japanese version Dryad (ドリアード,Doriādo?)) was Hydron's Mechanical Bakugan. It was, however, humiliatingly defeated by Boriates in CBA Mode (Custom Battle Ability Mode) prior to being upgraded.
Dryoid is a warrior-like Mechanical Bakugan that resembles Robotallion but with more streamlined armor. Dryoid has wrist gauntlets that can be used as Vulcans or sword projectors. Dryoid is also equipped with a small cannon on its back that can also act as a scabbard for its Murasame Blade. His body armor and sword can change colors due to combining certain Fusion Abilities. His most powerful abilities are Murasame Blade, its fusion ability combinations, and Gaian Reflector.
In Volt's Revolt, after Volt defected from the Vexos out of spite for the Alternative, Hydron and Dryoid battled against him and Boriates and nearly have the advantage over them, until Volt used Odin Shield to nullify Dryoid's Fusion Ability, and prevent Hydron from using new ability cards. This caused Dryoid to be defeat after Boriates hits it with Tempest Arrows. Dryoid later fights against Boriates in the final round, but all of it attacks are nullified due to the Custom Battle Ability that Volt used during the brawl. Eventually Dryoid was defeated after Boriates finished it off with Olympus Cannon.
In Payback, Hydron and Dryoid battled against Lync and Aluze after Lync was found having a copy of the alternative data. At first Dryoid has hard time reaching Aluze due to the latter's expended flight, which costed Dryoid the first battle after being hit twice by Aluze's attack. Later after Hydron used the Land Pressure Gate Card to immobilize Aluze, which caused the latter to fall, allowing Dryoid to win the second battle after it stabbed Aluze in the back. Later Hydron ordered it to go for Aluze's underbelly cannon, and despite Lync trying to stop Dryoid, the latter was able to defend itself. Dryoid succeed in stabbing the underbelly, which caused Aluze to fall on the ground, although Aluze attempted to attack Dryoid with its cannon, but Dryoid dodged it, and delivered the final blow to Aluze, ironically causing Aluze to be destroyed, and win the battle for Hydron.
In An Heir To Spare, Dryoid helps Hydron battle against Zenoheld. At first he wins a battle, but is badly outmatched after Zenoheld uses Assail Farbros and is defeated after a prolonged fight.
In Ultimate Weapon, Dryoid helps Hydron escape from prison as well as the blast from the Alternative System.
In Final Fury, he helped the Resistance defeat Zenoheld as well as destroy the Alternative. He destroyed Farbros, but was seemingly destroyed along with the Alternative, Zenoheld, Clay, and Hydron.
Double Caliber (Dual Caliber): Adds 600 Gs to Dryoid.
Prior to being upgraded, Dryoid cannot reach very high, and should an opponent stay out of Dryoid's reach, its options are limited. Aluze is able to stay out of Dryoid's reach, especially with Sky Impact, and hit Dryoid from the air. This weakness is overcome after Dryoid is upgraded and gains the ability to fly.