Since this years Harrowing the new Shadow Isles Crest has been used everywhere, but we haven't gotten any real indication to what it depicts. Until Kalista was revealed I assumed it was her, but that turned out not to be the case.
So who is the mysterious face depicting, and what's up with her crazy swirls? (It's probably just a coincidence, but it does remind one a tiny bit of Evelynn...)
its the new champion they revealed a few days ago.
http://na.leagueoflegends.com/en/champion-reveal/kalista-spear-vengeance-revealed
there was a champion that got cancelled a long time ago called Averdrian that had a swirl on his forehead as well, It'd be awesome if he was the inspiration behind this symbol, not saying they should release it but if it became a myth amongst legends it'd be really really cool
Maybe it really is the ruined king? I mean the figure looks rather young,but just because he is a king,he doesn't have to be very old,in fact it could be possible that the king was rather young when he broke the borders between life and death out of naviety.
It might also be just some general specter,I mean they did showcase an artwork for a ghost of the shadow isles that looked a lot like this(but they said that said ghost was just one of the many undeads and not even a champion),sadly I can't find him anymore,it looked like a blue ghost with a head similar to the icon who had a mace that looks like it was made of skulls/souls
I bet 
is Kalista's sister!
It's related to Kalista... no herself but it is however her Sentinel. When you use her W: Sentinel it has that same Ghoulish face.
