Greg Street, the executive producer of League of Legends MMO, recently confirmed that writer Graham McNeill is working on the game's lore.
McNeill is best known as the author of many novels in the Warhammer 40,000 universe. He has written and continues to write a number of pieces for the series. His works include such novels as The Horus Heresy, Iron Warriors, Ultramarines Omnibus, and more.
McNeill joined Riot Games in 2015 as a senior narrative writer primarily creating over-arching story arcs, writing short stories, novellas, comic scripts, champion bios, and scripts. During his time at Riot, he has contributed to the stories of Caitlyn, Azir, Elise, Kai'Sa, and many other Runeterra characters.