5 streaks of light appear above Curacha, each coming in from a different direction and each aimed at a different power plant or power grid hub, all outside of civilian-occupied areas. As they strike, they would vaporize the targeted infrastructure in clean blasts, leaving only glassy craters ~150m across and cleanly crippling the Curachan power grid and by extension everything that runs on electricity in the country.The Roachen Fleet has already begun an attack. Ships close to Roachen waters will begin to be littered with aircraft from the mainland. The two aircraft carrier convoy holds against the Duskilor and Morgnatha navies. This is of course due to higher militarization of Curacha, than Morgnatha and Duskilor.
And as simple as that, Curacha has started a war with half of the world.
Over in Corvermell, MR supercarrier vessels would be boarding civilians from Veyr-Parai and Petra Veyr. Each supercarrier is prepped to defend against anything from subs up to nukes and would presumably carry the civilians out to Morgnatha.
A radio message would go live to the world.
"Mechanica Rationalis has destroyed the Curachan power grid. This is a demonstration of our abilities and the least of our attacks. Curacha is advised to surrender immediately lest it forces further engagements."