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It is difficult to craft, as it requires a brewing stand, and thus, a blaze rod. Also, silverwood tree bark is required to craft a special conduit used in its crafting.
The most significant purpose it serves is to prevent unwanted essentia from pouring into the Aura, which would cause flux. An evil person might turn stacks of zombie flesh into magic tallow, bottling up the mortuus essence in glass phials and then intentionally spilling it into the aura node of an enemy's home.