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Creepball is an item added by Harken Scythe. It is an integral part of the Biomass planting system. It is used to create Creep Blocks by right-clicking on a block of Soul Sand to create a "Creepblock." Using a Glaive on this block allows you to plant Germinated Biomass Seeds, which can be harvested to craft Biomass armor and tools, and offering blood through an essence keeper or vessel speeds up the growth process.
Creepballs can also be used to tame spectral mobs once resurrected. After resurrecting a soul with a Necronomicon, right-clicking on the spectral mob this produces with a creepball bonds the mob to you. The mob will then follow you and defend against hostile mobs, much like a tamed wolf.