Burning Spellweave is part of the base game and can be found in City of Ash I and City of Ash II in normal or veteran mode. The set is bound on pickup. You can find all gear and weapon pieces in the dungeon. There are 4 unique set drops: Scamplord's Signet (Ring) which drops from Golor the Banekin in City of Ash I, Staff of the Grove (Restoration Staff) which drops from Warden of the Shrine in City of Ash I, Rukhan's Rugged Kilt (Pants) which drops from Rukhan in City of Ash II, and Fire Maw's Fang (Dagger) which drops from Horvantud the Fire Maw in City of Ash II. You can acquire light armor, weapons and jewelry of this set in the Daedric motif style.