Is There a Demonic Realm?

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We have an ever growing cast of demons in League of Legends. Nocturne, Evelynn, Tahm Kench, and maybe Shaco are all demons. They are rare enough to clearly not be your everyday occurrence like some monsters, but where do they come from and why? Evelynn was said to be born of agony. Tahm Kench is likely born from greed. Nocturne is born from fear. Demons in League of Legends are clearly made from intense concentrations of mortal emotions that, usually through magic, manifest into living negative emotions. However, where exactly do demons dwell? Is there an equivalent to Hell in League of Legends? Is there a central demonic gathering point when a demon is born? Are all demons drawn somewhere? I ask because lately most of the evils in League have been all leading to the Void.

Shurima is in a civil war, but is also bordered with Icathia where the Void has slowly been emerging. Mount Targon/Aurelion Sol has seen the Void slowly appear more and more across worlds, and have noted a dark presence within it that seeks to kill all life. The Watchers in the Freljord were the big bads of the Void likely sensed by Aurelion Sol.

Now all we need is for some weird Void thing to occur in Ionia/Noxus and boom, we're all Void. However, the demons (and Darkin) are unique in that they are not tied to the Void seemingly. They work on their own accord for their own desires and needs. I wish demons would be expanded more and made more into a culture than local legends.