With his mind made up about not giving the sects more of his lifespan when he doesn't need to, the heart of this small world can only be eaten or used for something more useful than eating. Those two options are the top contenders for what he plans to do with this world.
He is actually curious to see if eating a new Divine Position would change anything in Fenrir. But this is an experiment he is only willing to try later, when he is about to restart a timeline.
If he eats this world, he will certainly grow stronger by gaining more law fragments and more lifespan to use his power. But he already has a lot of lifespan, and there are other ways to gain law fragments, so he decided to use the heart of the world to create a powerful minion.
If this minion idea works, he will have powerful tools that he can use without having to spend a lifespan to activate. Not only that, but these ant drones would also be useful in the second dimension, where the power of cave heavens can't be used.
