Zaun was given three choices about what to do about the pending Voidpocalypse, as they stood before the portal within the Shuriman mines:
- Nuke it from orbit: it’s the only way to be sure. Let Demacia use Cosmic Purity to destroy the pyrikhos in the mines and shut the portal. Guaranteed to work, but will render the dark sand in the mines inert.
- Have cake, eat cake. Try to close it with Extradimensional Theory. Will keep the pyrikhos usable. 80% odds of success. Failure means Voidpocalypse.
- I’ve decided to become a Bond villain. Try to control the portal, deciding which factions get hit with Voidlings. 40% chance of success. Failure means Voidpocalypse.
They chose option two. This called for a d10 roll. On a 1 or 2, there would be Voidpocalypse. They rolled a 10. Malzahar was all, “BOW BEFORE THE VOID” and Zaun was all “lol no” and Kassadin probably appeared out of nowhere to silence him in the face. The portal closed.
What happens now? Well, we finish the tournament, and then the League starts sorting all this stuff out. Demacia’s army has been absolutely wrecked, and the League is furious. Now they face a resurgent Noxus backed by a Zaunite army that did not exist even a few months ago but has proven itself a worthy adversary for the mightiest military force in Valoran. From their own perspective, though, they did the honorable thing, taking drastic measures at great risk to themselves to ensure that Runeterra would not suffer another Void War. Bandle City and Piltover are in a similar situation.
This will develop more fully in the final lore updates of the arc, and in the setup for the next one.