While the black fat worm was still eating shards of bones and ashes in the mass grave, he took out a large altar built with bone.
This altar is a Metac called the Curse Altar. It is used to amplify the power of a Curse. It is also used as an anchor to prevent a backlash when a curse fails.
In this case, the death cultivator plans to use the Curse Altar Metac for both of these things. He needs the help of the Curse Altar Metac to curse ten thousand people without exhausting himself and dying because of the burden of the curse.
The assistance of the Curse Altar Metac isn't free, though. He has to imbue the altar with various special materials and a lot of energy for it to work. This is why he took it out, set it in the ground, and began preparing it.
This Curse Altar Metac is as large as a coffin. It is also white because of the bones that were used to build it.
