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|Appears in:|| Fate/hollow ataraxia|
Fate/kaleid liner PRISMA☆ILLYA
|Japanese VA:|| Naoko Takano|
Jōji Nakata (Drama CD)
|English VA:||Joanne Bonasso|
|Character type:||Mystic Code|
A Kaleidostick, a magical device that enables its user to become a magical girl. Though Ruby initially belongs to Rin, Rin's constant squabbling with Luvia causes Ruby to abandon Rin and contract itself to Illya instead. Ruby is Sapphire's older sister.
Ruby is a sadistic Mystic Code that hates its creator, while also enjoy teasing and annoying it's user/master. Aside from its sadistic traits, Ruby can be exceptionally loyal to its master; especially Illya, such as warning her about the dangers of invoking Zwei form on her body. Of course even with its loyalty, Ruby can be extremely manipulative, as it was able to smoothly trick Illya into proceeding through all three steps to establish a contract with it.
Comically, Ruby prefer method of teasing Illya is to reference her crush on her brother and then providing Illya a method to "win" his love, usually through manipulation.
Ruby and its sister Sapphire abandon both Rin and Luvia respectively when they had grown tired of the two's quarreling for the last time. Reverting the transformation on the two girls while they were fighting, the wands left the two to fall from mid-air and went off to find new masters with Ruby's choice being the reluctant Illya.
Ruby's combat functions allows its to manipulate the mana within the user and assist them by either acting as medium to fire energy blasts or reinforce physical parameters. More experience users like Rin display the ability to condense mana onto the tip of the wand to create a blade durable enough to clash with Excalibur.
Defensively, Ruby can form a transparent barrier with A-rank strength that while powerful by modern standards, can only barely resists attacks like Caster's Rain of Light spell from the Age of Gods as Illya could still feel the intense heat from the beams. In close combat situations, the shield can be compress into a sort of second skin strong enough to stop a slash from Excalibur, but doing so would require diverting a large portion of mana. With the proper training and/or the right amount of imagination, the Kaleidosticks can also grant its user the ability to fly.
Outside of combat, the Kaleidosticks have demonstrated the ability to transform into wireless communication devices complete with live video chat. The two wands can also trade data between each other with a build in USB-like wire and port.
Humorously, it has been implied that Ruby is a very skilled chemist as she keeps multiple powerful sedatives, able to cause the victims to enter a 'nirvana'-type trance when injected, handy as well as a truth and love serum.