Aatrox and Illaoi
As we can see in the files and in the wiki,Illaoi has a special interaction with Aatrox; "We know your true name,we do not fear you" Any info Riot please?????
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My favorites of them are her sexual advances on Braum.
"There are motions I would like to show you" "Finally, a man who won't break" "I know you are strong. I wonder if you have stamina" ( ͡° ͜ʖ ͡°)
I'd imagine it's knowledge gleaned from either Nagakabouros, ancient history kept on Buhru, or teachings of Illaoi's religion. Either way it makes sense a God described as being in everything would know the true nature of the Darkin.
Makes me wonder what the "true name" part means. Perhaps like demons, the Darkin existed differently in the time prior to them interacting with humans.
Btw guys,Illaoi's quote for Rek'sai: "You ugly thing,only fools made you"(or something like that) is more suited towards 
Hmmm I wonder what does Illaoi thinks of Shaco Vladimir skarber and such creatures
Im pretty sure that Aatrox is his true name... in other hand, that quote would more sense towards 
Aatrox could just be the name he goes by currently. It's possible that he's changed his name or finds no real reason to remember names. His remembered by his actions, which become shrouded in myth.
Actually this somewhat bothers me about Aatrox. Where does he go when there are no wars? His presence is shrouded in myth, which means that he's not someone you'll see often. But look at him, he sticks out like a sore thumb. Does he have an ability to change his appearance?