It is up for debate what the rarest aura is, but in my opinion, this is the rarest of them all. Also the coolest.
My account: https://www.roblox.com/users/20376909...
Game: https://www.roblox.com/games/16095412...
Helpers: https://www.roblox.com/users/19987335... and https://www.roblox.com/users/22036842...