Aetheric Sigil
Tier M · 9. Proof of Mastery
The permanent key to Mastery (M-grade) alchemy, the top of the ladder. Earned by handing the Proof of Gilded Mastery to the alchemist at level 70. It cannot be traded, dropped or stored in the warehouse.
Craft cost including the Cauldron chance, and prices on all four servers — in the service.