Voidglass

Where to find it: The Vault (Shattered window, Mining 70; Concentrated Voidglass, Mining 70; The Last Dealer), The Thunderhead (Concentrated Voidglass, Mining 70; Voidglass shards, Mining 70), The Thieves' Guild (The Quartermaster, Thieving 75; The Ringleader, Thieving 90; The Grand Larcenist, Thieving 97; 2 more), Starfall Rift (Crater Wisp; The Wandering Meteor).

“The Vault's windows, after whatever happened down there. Sharp, cold and very hard to look at.”