Arachne is a Phantom born from a Gate who gave up in despair and an antagonist in Kamen Rider Wizard.
He was voiced by Daisuke Kirii.
Kamen Rider Wizard
His target is Masahiro Yamamoto, who is out purchasing baby items for his pregnant wife at a flea market. He is able to merge with the ground, possessing a hard exoskeleton, clawed hands, and an axe. Arachne is also very fast, rivaling Wizard's speed in Infinity Style.
Kamen Rider Taisen
Arachne was revived once again with other Kaijins, and join Underground Badan Empire. He was part of a force led by Tiger Roid, Yamaarashi-Roid and Kamen Rider Fifteen to invade the surface and attack the Armored Riders to kidnap Shu for plans. When the Space Break System has risen, Generalissimo of Badan summon other Leaders, Kaijins, henchmen army to eliminate Ryo Murasame and Gaim. Ryo reveal Heisei and Showa Riders that they supposedly been defeated had in fact been sent to Helheim Forest, to help support Ryo and Kamen Rider Gaim. When Badan Army battling the riders, Generalissimo of Badan reveals itself as a giant tyrannosaurus head monster started to attack on Riders and the armies.
- Like Valkyrie and Sylphi before him, Arachne is a male Phantom based on a figure of mythology associated with females. Unlike the two previous Phantoms, however, Arachne was a female human cursed by the goddess Athena.
- Arachne's axe is the same axe Sylphi once wielded.
- Arachne's costume is modified from Manticore's costume.
- He is the only Phantom seen within the series to not have his human form shown. The only other Phantom sharing this "honor" is the movie exclusive Khepri.