Considering there are several factions, city states in the lore. I have a question about the Shadow Isles. Would Champs from the Shadow Isles unite to fight a war against let's say the void invasion which deems to destroy everything and consume all?
Champs like Thresh and Kalista, are they on the same side? I mean would they fight side by side if something threatened the shadow isles?
Kalista despises Shadow Isles. Herself included
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Have you read this yet?
I think the most of the Shadow Isles would just sit back, see who wins the fight and strike before the winner has a chance to recover at all. 
would just be enjoying all the death.
Would Champs from the Shadow Isles unite to fight a war against let's say the void invasion which deems to destroy everything and consume all?
More dead people = More creatures from the Shadow Isles.
So, if the Void invade the world, the undeads will just laugh and increase their army.
Champions like Kalista or Maokai would help to stop the invasion, maybe, but they would never work together with the rest of the Shadow Isles... Even if that means the destruction of the SI (In fact, they might even help the invaders in order to destroy the Shadow Isles)
I asked a similar question to Riot but it was with Ascended. I asked what would Xerath do in a Void Invasion.
I believe Shadow Isles wouldn't fight against Void in Runeterra's side, but they would kill any of them if they saw.
In other hand, Xerath would probably fight against Void, even in side of Runeterra. Because he is not pure evil and he needs Runeterra for benefits.
