The Nether Tree first devoured all the blood from the Blood Pool before its roots dug deep into the ground, using the energy to grow more roots that kept on growing deeper and deeper underground until they reached the planet's core. Once the core was reached, the roots gently wrapped around it and slowly released Nether Energy that was injected into the core.
On land, the demons didn't have any challengers because no one could match their numbers and strength but the sea, the sea was a completely different story.
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The waves rose and fell like they'd been provoked by something, like the sea god had been angered. Many fishermen at shore ran away but those with boats were drowned by the sea waves that destroyed their boats.
The locals living on the coast abandoned their homes and ran away.