Okay, so Shaco's biography is that he was crafted long ago as a plaything for a lonely prince, and he was then corrupted due to dark magic. The key here is "lonely prince". In every folk lore tale in Amumu's bio as well as his short story, he is referenced to be the prince of Shurima. It might be a stretch, but Shaco could possibly have been crafted for Amumu if he was lonely even before whatever happened that made him forever alone. And speaking of Amumu, remember the music video The Curse of the Sad Mummy? Even if it was made wayyy before Kindred was released, something about the black mist stuff reminds me of Wolf. And, at the end of the video, there's white and black mist spiraling around Amumu. I'm just wondering if that has anything to do with Kindred or if it's just a nice coincidence.