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The Blood Crucible is an item intended to work in tandem with the Altar of Blood originating from the Harken Scythe mod. The Blood Crucible is crafted with Netherrack in a similar formation to that of a cauldron, with the exception of an Ender Pearl in the center tile. It will store up to 100 blood "units", gathered by collecting said blood in essence keepers and vessels after being spilt by the use of a glaive.
Destroying a filled crucible of blood will spawn multiple hemoglobin, which behave identically to slimes. You may right-click a Hemoglobin with an empty essence keeper/vessel to kill or divide it instantly. This also refills the empty essence keeper/vessel depending on the size of the slime (up to how much you originally had in the crucible).