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Peta's is the second strongest Chess Piece Knight and their strategic officer, making him a dangerous enemy. As the anime goes on to explain, Peta's ÄRMs themselves aren't very strong, though he uses his intelligence to find many other uses of them. His ÄRMs are:
 * Sickle Death: Weapon ÄRM, a scythe engraved with a gory vulture's head.
 * Magic Mirror Ring: A Dimension ÄRM, used to record something then allow him to broadcast it over any/multiple reflective surfaces (even the moon and Sun) or through other communication type dimension ÄRMs. This is how people watch the War Games when the fighting takes place somewhere else. Strangely, even after Peta's demise the battles are broadcasted throughout MÄR-Heaven.
 * Dark Reflector: Dimension ÄRM. In the manga, a round mirror which bounces attacks back away from the user, while the anime pictures it as a portal which absorbs the attack and then blasts it back in the caster's direction.
 * Blood Body: Nature ÄRM which recreates the body of the user into blood, thus immunizes it against all physical attacks.
 * Garnet Claw: Ghost ÄRM, a set of razor-sharp blood-colored claws that are made from the users fingernails.
 * Blood Syringe: Unique ÄRM, spiked glass orbs are created and launched at the victim(s). If they hit they will drain blood from the target until they burst, at which point the blood flows at the master of the ÄRM. The user can then Coagulate the blood into different weapons, including bladed stones to throw at the living enemies.
 * Abyss Cannon: Ghost ÄRM, tortured souls are called from hell and fired at the enemy as a mouthed cannonball.
 * Chain Soldier (anime): A Guardian ÄRM that summons several armored soldiers linked together with chains used to ensnare Peta's enemies. However, the soldiers are useless without their chains.
 * Body Eye: Peta's opera necklace Guardian ÄRM which calls forth upon earth a wingless Diablo with runic bonds sealing its lower half. However the demon doesn't possess any satanic extraordinary; its power manifests in a myriad of bats while Body Eye itself wrecks massive destruction with its hands.