Airship Syndicate, the developers of Battle Chasers: Nightwar, is currently developing the Ruined King: A League of Legends Story and is set to be released this year. There's a slim chance that it will be available here on GoG but I might as well try. Vote for it in the community wishlist.

https://www.gog.com/wishlist/games/ruined_king_a_league_of_legends_story

Trailer: https://www.youtube.com/watch?v=PpRRLYJ5fIQ