The symbol in the Noxian arena
That doesn't look like a Axe with eyes... Its a Raven!
That doesn't look like a Axe with eyes... Its a Raven!
It also looks like 2 wolves facing away form eachother like the Chaos crest form Godking Vs event
It's the crest on Swain's back.
I had two thoughts about why it's different but the TL:DR was that the Raven crest is the current symbol for Noxus while the Darkin crest (It looks like a Darkin to me) is outdated.
The first thought is that the Darkin crest predates Noxus and that the Raven crest is more usual, which would be further indicated by the only building with the Darkin crest we know of being the Immortal Bastion, which predates Noxus. The hole in this theory is honestly that we don't know if any other building uses the Darkin crest and the crest is also pretty frequent on armor and flags, indicating that the Raven crest is a lot more recent.
Which leads to the second thought: the crests represent the grand generals, with the Raven representing Swain and the Darkin representing Boram Darkwill. With a recent turnover of power, Boram's crest would not only be common but a rallying symbol for people against Swain. Though not so much a hole, this particular theory does call into question why Boram would've used a crest resembling a Darkin, either as a question of whether or not he knew what it was or, if he did know, how he knew (Darkin don't appear to be a common knowledge thing) and why he chose it.
Of course it could also be like other people are saying and just be two wolves facing away from each other which would kinda make sense given the wolves probably being Draven and Darius
That's a fantastic detail! Thanks for pointing it out.