Medusa's dress, armwear, and leggings have a tattered appearance, and they leave a number of small patterns on her skin. Breaker Gorgon is greatly changed, showing a pattern with an eye in the middle. She fights straightforwardly with her dagger, overpowering her opponent.
Illya and Rin Tohsaka encounter the Rider Class Card manifested in the schoolyard. Although Illya is able to fight, she is too inexperienced to win. Before Rider can use Bellerophon, Miyu arrives and uses Gáe Bolg to slay her and obtain the Class Card.
Medusa's specialty is utilizing her high agility to perform acrobatic maneuvers that lead the opponent on and provide her the momentum in battle, but she is lacking in hand-to-hand combat ability. She can summon a Pegasus and Bellerophon, a golden bridle able to control any mount. She predominately utilizes it for the Pegasus, granting it a rank up in all parameters upon releasing its true name. Its magical energy is gathered, becoming a "shooting star" as its "super-charge" pulverizes the target.
Her Mystic Eyes that can petrify targets simply by sight are sealed by Breaker Gorgon, a Bounded Field meant to confine the consciousness of a target to watching a "nightmare of both delight and taboo" while sealing all abilities they possess in the outside world. It takes the form of a visor to seal her Mystic Eyes. Her Mystic Eyes are of the highest class, Jewel, and they can entrap, paralyze, and slowly petrify the opponent with a glare. Those that can resist will be exposed to a "pressure" effect that lowers all parameters by one rank.
Including the Rider Class Card grants the user Medusa's Iron Stake, stakes fastened to iron chains. They possess no overt abilities, but they are hard to remove from the opponent upon stabbing them.
Installing the Rider Class Card grants Medusa's outfit, combat abilities, and Mystic Eyes. They can summon the Pegasus, turning the Iron Stake into Bellerophon's bridle of light, allowing them to force the Pegasus to charge. Both of Miyu's eyes are converted, but only one of Illya's becomes a Mystic Eye.
Chains fastened to stakes made of iron. Has no special effect, but when stuck it's really hard to remove.
Obtains legendary Anti-Heroic Spirit XXXX's abilities. Is not a legitimate Heroic Spirit, but rather an existence that is hostile to Heroic Spirits. Her forte is capitalizing on her high agility nature to perform acrobatics that leads the opponent on, giving her the momentum. However, her hand to hand combat ability is lacking.
Bellerophon: Bridle of Chivalry: A+
A golden bridle that can control any vehicle. It is predominately used for the summoned Pegasus. When the true name is unleashed, all the Pegasus's parameters gain 1 Rank Up. All magical energy is ? and like a shooting star, its super-charge pulverizes the target.
Breaker Gorgon: Self Sealing・Temple of Darkness: C-
A bounded field that confines the target's consciousness to watching a nightmare of both delight and taboo, and at the same time sealing all abilities they have in the outside world. Commonly in a visor form sealing one's own mystic eye
Cybele: Mystic Eyes of Petrification: B~A
Mystic Eyes that petrify the target just by sight. In Miyu's case both eyes were exchanged but in Ilya's, only one eye was. Interference power lower than the original, highest class known as "Jewel," mystic eyes. When glared at by these mystic eyes the person will be entrapped, paralyzed and slowly petrifying. However for people able to resist petrification, they will be exposed to an all parameter 1 Rank Down "pressure," effect.