This was the darkness that Soverick foresaw. It came to the Tree Father to inform him of the two choices he had. He could allow the Will of the Universe to perform the fusion for him, or he could do the fusion on his own.
If he lets the Will of the void universe perform the fusion, the fusion would be quick. Not only would he successfully become a divine spark, but he would also be able to become a world forge immediately after.
The catch for that proposition is that he will have to become an Archon for the void universe. He would be given the Authority of the void universe and become a god of the void universe.
This is a very powerful gift because World gods would not be his match of he becomes an Archon. Unfortunately, he will never be able to leave the void universe after becoming an Archon. At least not without losing most of his powers and reverting to a divine spark.