The plan was to make the inhabitants of the world wear the invaders down. But that wasn't going to work if the invaders continued to stay out of the ocean. So the will of the world got to work fixing that problem.
The will of the world made large dark clouds appear in the sky. The dark clouds were so large that they covered the entire world. This caused the world to become shrouded in darkness.
The large dark clouds blocked out the light of the sun. Then they began unloading the large amount of moisture within them.
As rain fell over Oceania, the water level began to rise. The island they were standing on was slowly being submerged in water.
Even if they left the island and flew high into the sky, the will of the world was so hell-bent on bringing them into the ocean that it would make the rain continue to fall until the water level rose to reach the sky.
