War it is.

So far, Morgan tried to keep the matter as diplomatic as possible. The East has always been problematic towards the North and every deal and peace always failed and always because of the East.
Morgan knew that the North would win the war if they attacked the Empire themselves but tried to avoid to, the idea of exterminating a huge amount of Auriold, even though from the East, never appealed him much, but his mercy is as small as his patience. The picture they sent him was unacceptable and it meant immediate war, but true war.

Since when Morgan gave the order to prepare to siege, within 2 hours the entire Royal Army was prepared and ready to move. He doesn't even need to say much to motivate the army, he takes his place at the lead of his own squad. All of the soldiers are well-prepared and know exactly what they are going to do and which strategy to use, so no further preparation is needed.

Immediately, they all teleported to the Eastern Continent, each squad to its target. They will attack from every front, capturing every village, town and city on their way until they'll reach the Capital, in which Morgan intends to bring the FINAL end to this foolish game the East has been playing.

And that's exactly what happens. In about 4 weeks, the Northern army conqueres every inhabited corner. Civiliants who don't turn hostile against them spared. Soldiers and every hostile citizen destroyed in quick and deadly battles. Orphaned children sent to the North, as well as the few hurt innocent people from the place.
Not a single one member of the Northern Army gets seriously wounded nor killed.
When they reach the Capital, the biggest battle occur, but again, there is little to nothing the Imperial Army can do against the Royal Army.
Morgan fights among his army with no mercy.

At the end of the battle, he calls for the new Emperor to show up, or they'll simply siege his Palace. He is not going back without Dorian, that's sure.