If the two gem kings are killed by the invaders, that would make his situation worse because it would mean that the new invaders are stronger than the gem kings.
He, as the Sovereign of the world, doesn't want a new invasive force that is stronger than the last one. To him, the devil he knows and his familiar with is better than a new and unfamiliar devil with unknown motives.
So after cursing the two gem kings, he returned to his position in the sky and looked towards the north pole, expecting good news.
The red gem king and the green gem king flew to the North Pole at their fastest speed. There were weaker gem kings following them, but they were quickly left behind by the two gem kings because they were slow.
By the time the two of them got there, a brown storm had surrounded the whole North Pole from every side, and numerous dust hurricanes were roaming the borders of the North Pole.
