Ayardium
Ayardium is the rarest of rare minerals, obtainable not from mining salvage but from only awarded upon completion of all talismans of the Elder Gods talisman set. Consuming ayardium bestows a random rare mineral bonus for a third of a day (or 20 minutes [22 minutes for Tash'la in that other context]). Ayardium itself is a consumable artefact, miraculously resetting itself back to its owner for fresh consumption after two days.