Also known as: 仮面ライダークロスセイバー
Kamen Rider Saber's final form. It is accesed by Unsheathing the Haouken Xross Saber on the Swordriver.
This form has the record for having the longest transformation announcement of any Kamen Rider form:
Seiba Battou!
Haouken Xross Saber! Sōsei no jūji! Kirameku hoshi-tachi no kiseki to tomoni! Kedakaki chikara yo yūki no honō! Xross Saber... Xross Saber... XROSSSS SAAABBEERR!!!!!
Majiwaru jūpon no ken!