The Void needs an 'End-Game', and it should be OMEN!
Omen is something of a legend in this community as a failed Champion concept, was actually canceled for Riven. Omen was a very scary looking bastard and the world just wasn't ready for it.
It's very disappointing to me, because Omen looks like he'd fit right into the current art style of League, and he looks like a good candidate for a new 'Void' creature.
With champions like Cho'gath, Vel'koz, Kha'zix coming to RUneterra, one could say the Void is studying, collecting and preparing for something much greater.
I hope Riot will consider bringing Omen in as the Void's ace-in-the-hole. He'll be the "ultimate" Void creature backed by all of the power, material and intelligence gathered by the others. This could be be presented in-game as a champion who leads an 'assault' onto the Rift; corrupting the map over time as his team takes turrets, spawning Void creeps down lanes, calling in small-radius high-power air strikes using transmuted Void material that Cho'gath ate, or firing off his own spikes as suppressing fire.
And a champion that looks as scary as that most certainly needs a leap with a killer SFX scream, or some kind of "Never sure where he is" ability.
Maybe Riot has forgotten or given up on Omen, but that doesn't mean we have to. How do you think he would play on the Rift, or what do you think his role will be in the lore?

, if you mean the main deity which controls the Void that will definately not be a Champion but he will be in an event or something