He returned to the Weapon Refinement room.
The massive Corpse of the Giant Whale King was submerged in a pool that was one hundred meters in length and width, and Levi had re-attached its severed head.
Within the pool, the "Corpse Water" brewed from numerous rare materials worth 300 million Aether Stones collected by Levi emitted a ghostly green gleam, pervading the air with a pungent stench.
The Corpse Water contained over a hundred types of deadly toxins, including poisons above level 6.
Additionally, there were more than a dozen water elemental metals of rank five and level 6, as well as a small piece of Level 7 Ghost Water Fine Iron, all slowly being absorbed by the Corpse Water.
After a lengthy soaking and spellcasting process, the Giant Whale King's body would absorb all the substances in the Corpse Water, refining the already formidable Sea Clan body to be even more robust.