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|This article is about a/an event in Kamen Rider Decade.|
After Tsukasa Kadoya traveled to multiple A.R. Worlds, Wataru Kurenai appeared before him saying that his true mission was to defeat the Nine Heisei Riders. Wataru stated that in order to save the worlds, Decade should have defeated those worlds Riders in order for these worlds' stories to unite with each other through him. Instead, by befriending the Riders of each world, Tsukasa unintentionally did not prevent the merging. The result was that all the A.R. Worlds' Riders faded (with the exception of Yusuke Onodera).
After being attacked by the original Riders, Tsukasa realized what needs to be done, thus allowing Decade's base form to evolve. Known as Decade Violent Emotion, this form allowed him access to every Kamen Rider's powers without transforming into its respective Rider. With this new power, Decade became more aggressive. One by one, he hunted the Riders in order to fulfill his true mission, separating himself from the others.
After defeating the pre-Decade Riders, Tsukasa allowed Kamen Rider Kiva-la to mortally wound him, so that Natsumi can become the connection between the Riders and the Rider War would end in Decade's death.
|Kamen Rider Decade||Tsukasa Kadoya|
|Kamen Rider Diend||Daiki Kaito|
|Kamen Rider Kuuga||Yusuke Onodera|
|Kamen Rider Agito||Shouichi Tsugami|
|Kamen Rider G3‑X||Makoto Hikawa|
|Kamen Rider Ryuki||Shinji Kido|
|Kamen Rider Zolda||Shuichi Kitaoka|
|Kamen Rider Ryuga||Dark Shinji|
|Kamen Rider Faiz||Takumi Inui|
|Kamen Rider Kaixa||Masato Kusaka|
|Kamen Rider Psyga||Leo|
|Kamen Rider Blade||Kazuma Kenzaki|
|Kamen Rider Garren||Sakuya Tachibana|
|Kamen Rider Chalice||Hajime Aikawa|
|Kamen Rider Hibiki||Hitoshi Hidaka|
|Kamen Rider Ibuki||Iori Izumi|
|Kamen Rider Kabuto||Souji Tendou|
|Kamen Rider TheBee||Masato Mishima|
|Kamen Rider Gatack||Arata Kagami|
|Kamen Rider Caucasus||Issei Kurosaki|
|Kamen Rider Ketaros||Tetsuki Yamato|
|Kamen Rider Den-O||Ryotaro Nogami|
|Kamen Rider Zeronos||Yuto Sakurai|
|Kamen Rider Kiva||Wataru Kurenai|
|Kamen Rider Ixa||Keisuke Nago|
- The Rider War of Decade and the Legend War of Kaizoku Sentai Gokaiger, which saw the first 34 Super Sentai, the predecessors of the Gokaigers, joining forces and sacrificing their powers (which resurfaced as Ranger Keys) to destroy the invasion armada of the Space Empire Zangyack, were noted by Narutaki as one of the similarities between Decade and Gokaiger in the Super Hero Taihen net movie The Grown-ups’ Narumi Detective Agency Ep. 1: Is Gokaiger a Ripoff of Decade?.