User blog comment:Krauserlols/Is Riven a real Wind Master?/@comment-1695916-20131217214754

The killer used a wind technique. Riven's 2nd ultimate is called "Wind Slash." She does not necessarily have to be a master. Also, when Riven uses her ultimate, Yasuo says' "Wait... That technique."

I highly doubt it was Ao Shin. Who ever said the elder was killed by a wind technique must have seen a giant freakin dragon nearby. All we know is that the witness must have seen a sillhouette of a human.

Janna never touched the Ionian-Noxian War. She spends her time in Zaun. Nor, does her biography mention anything about it.