The Riviere Hyll is massive, armored aircraft carrier used by the Rebel Army. It first made its debut in Metal Slug Attack in "Perfect Doctor".
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The Riviere Hyll is operated by crew of three Rebel Infantry; one pilot and two crew members. As it is heavily armored, it does not carry any weapons of its own (despite having functional turrets); instead, it deploys Flying Taras from its hangar bay that begin swarming enemies and dropping bombs. It is also armed with poison drum bombs which are deployed from the side by its crew, which fly around in a loop before crashing onto the ground, leaking poison gas wherever it goes.
The front of the carrier is also protected with a heavily armored hull that allows it to take additional punishment and stay airborne for as long as possible. It is also outfitted with technology that increases its durability against specific attacks and ability to repair itself, further increasing its already impressive durability. Once this hull is destroyed, it remains functional for one final time, after which it crashes to the ground, killing its crew.