So I was digging through Maokai's voicelines.
Surprisingly, he had a voiceline towards Jayce, and even more surprising, it reveals something strange:
"A voice follows this one! A song, like those in the Mist!"
A voice? A song?
Immediately I thought of the Hextech Crystal inside of Jayce's Mercury Hammer, a crystal that once belonged to the Brackern.
But, why is the Brackern's song like those in the Mist?
Could the Brackern somehow be related to the Black Mist?