Rider War (Hydra)

The is a great battle in the Mirror World where 22 Riders are to do battle with each other until only one of them survives. The victor in this grand Battle Royale will be granted his/her wish.
The battle itself was discovered and used by Billy's older brother, Scratchy Econ. Although the victor is awarded the wish, Scratchy manipulated the war for his own. In actuality, Scratchy plans to become the victor so that he could wish for Billy's well-being.
He constantly intervenes with the fights through the puppet Rider, Kamen Rider Odin, so that he can gain the upper hand. Although the power of his puppet was said to surpass the others, Hydra and Darkdra have always miraculously overpowered them.
Despite countless attempts at manipulating the results of the war by Scratchy to ensure victory for Odin, ultimately Ryuki tands as the last survivor and winner of Rider War, last beating Odin after Odin fades away thanks to Billy successfully convincing Scratchy to stop the destructive course of his actions.
==Kamen Rider Hydra: 2WORLD 1HEARTS==
==World of Hydra==
==Kamen Rider Quartzer==
==Known Participants==
===Official Participants===
Kamen Rider Hydra 	Shinchi Momo ► Sam Lemon
Kamen Rider Darkdra 	Dark Sam ► Kuroi Lemon ►◄ Joe Ramirez ► Brandon Walsh
Kamen Rider Ryuki 	Shinji Kido ► Sam Lemon , Sam Lemon
Kamen Rider Knight 	Brandon Walsh ► Ken Mizuki
Kamen Rider Scissors 	Shigeru Genjirō ► Rough
Kamen Rider Zolda 	Zaomaru Nara
Kamen Rider Raia 	Ryoko Okamura
Kamen Rider Gai 	Genjirō Nozaki
Kamen Rider Ouja 	Ozawa Tonda
Kamen Rider Odin 	Sixth Odin ► Seventh Odin ► Eighth Odin ► Unnamed Man
Kamen Rider Tiger 	Tomizo Ishikura ► Alain Ruby
Kamen Rider Imperer 	Imata Tani ► Tonza
Kamen Rider Femme 	Michi Midorikawa
Kamen Rider Ryuga 	Dark Shinji ► Dark Sam
Kamen Rider Verde 	Victor Mishima ► Alie Blackfive
Kamen Rider Cerberus 	Copper Jinno
Kamen Rider Papillon 	Penelope Kusakabe
Kamen Rider Abyss 	Aki Matoba ► Unnamed Man
Kamen Rider Ryu Blade	Rei Hirose
Kamen Rider Bloom 	Brooker Bito
Kamen Rider Jackie 	Jiiya Takemiya
Kamen Rider Jagā 	Lilac Shiraishi
Kamen Rider Nekoki 	Takeru Setou
Kamen Rider Nekoga 	Dark Setou
===Unofficial Participants===
Kamen Rider Hydra	Logan Lemon
Alternative 	Shigeru Izumi
Alternative Zero 	Goro Adachi
==Note==
*It seems that the wish cannot revive the deceased, as shown when Shinji fights to wake up Ren before he dies and Scratchy Econ orchestrates the entire war to make sure Billy gets a new life before his twentieth birthday. This is somewhat contradicted by Episode Final and the S.I.C. series, though in the former has Lilac preserve her sister's body in ice to make sure she revives.
*Even though Scratchy only grants the wish of the winner of Rider Fight, in the end three Riders (Ryuki, Hydra, and Raia) would have their wishes granted by Scratchy. Ryuki had his wish (brought Ren back from coma) granted once he's declared the winner, whilst Hydra and Raia's wishes (stop the Rider Fight) were unintentionally granted when Scratchy used the power of Time Vent for the last time to stop the Fight from happening in the first place.