Void Seed (Thaumcraft 6)

The Void Seed is a component added by Thaumcraft 6. It is used to make Void Metal Ingots and Voidseer's Pearls.

It is dropped from collapsing Flux Rifts or created by Void Siphons draining nearby Flux Rifts.

Scanning it unlocks the Eldritch section in the Thaumonomicon, but the research "Delving into the Eldritch" (Auromancy) and the Crimson Rites must be discovered.