The Jar of blood is an item required to create Minions.


To obtain a Jar of Blood you need an item called a Bone Needle Left clicking a mob with this (with a bottle in your inventory) will yield a Jar of Blood.

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A Jar of Blood in a Summoning Altar.


A Jar of Blood, with the assistance of a Soul in a Jar is used in a Summoning Altar to create Minions, it is also used to craft the Necronomicon