Syndras Creation (Includes Ahri)
Ahri started as a Fox as everyone knows. So my theory is that Ahri once Humanish had been gifted with a high magic potential. So now theirs the theory that Zed is nocturne in the future (Look up the theory). So what is Ahri found Zed when he was turned into the Nightmare (Nocturne) and some of the magical residue got to Ahri and eventually when she died she was reincarnated as Syndra. (I got this theory because they both throw balls :D )