Actual nice job on quickly reaching a decision guys.
My only comments are that I'd like this to continue quickly. Since the person will be rping the Reibi I don't care who it is, just quickly pick somebody, here are the Reibi's abilities for reference there.
"Like Kurama, the Zero-Tails has the ability to sense negative emotions, which it uses to seek out and possess anyone who is emotionally unstable. Afterwards, it begins to feed upon the darkness within one's heart and allows the spirit to create dark chakra (闇のチャクラ, yami no chakura). The dark chakra produced by the Zero-Tails grants its host a great source of power, giving them access to high-level techniques without needing to form hand seals while negating any potential drawbacks those techniques may otherwise bring, as well as powering up the entire floating fortress. So long as there is darkness in one's heart within the Zero-Tails' vicinity, it can continuously produce dark chakra at an unlimited rate. However, as with normal chakra, it requires proper control to use beneficially, and a disruption in the control flow can cause severe backlash that can ruin the user's body, as Shinnō heavily deteriorated when Sasuke Uchiha struck his tenketsu.
Along with its ability to detect negative emotions, it also appears to have the ability to read the hearts of others, seeing as it saw Naruto's urge to rescue Sasuke Uchiha, and his pain when he was unable to bring him back.
The Zero-Tails is able to generate many arms from its body, which can extend to great lengths, as well as being able to instantly reattach itself whenever it lost a part of its body, even its head."
So you've got unlimited chakra and arms. Good luck.
Secondly what is my win condition? Is it an OOC fight I just need to win as if it was a bijuu challenge or should I have to actually seal the beast?