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Thaumcraft 4 Research Notes
Bites from beyond
"It is time to push your infusion vat to its limits. Few materials are as inimical to organic life as voidmetal, but if a creature's fangs could be somehow imbued with its properties, the beast would be left with a peerlessly sharp bite and the ability to inject eldritch venoms into prey.
The Eldritch Fangs infusion accomplishes this while magically insulating sorrounding tissues from its effects. The process is quite dangerous... but that has never stopped you before."
Mob Infusion Recipe
Eldritch Fangs has no known uses in crafting.