Of its 10 pieces, 5 drop from bosses, 3 are sold by vendors and 1 is made by a profession. Every piece is Cloth armor. The set was added in patch 3.0.1.
Source is the collection journal’s own source for each appearance, read from the current retail build; bosses, quests, recipes, prices and requirements come from the game’s item, journal and quest records.
What This Set Covers
This is a complete head-to-toe outfit - it fills 8 armor slots, so it can be worn as a full look with nothing borrowed from another set. Every piece is Bind on Pickup, so the appearances have to be earned rather than bought.
Slot and binding read from the current retail build’s item records for this set’s own pieces.
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Where These Pieces Drop
5 of this set's 10 pieces drop from 4 encounters in Naxxramas and Vault of Archavon. The rest come from vendors, quests, crafting or world drops, which the dungeon journal does not record.
Drop chances are not stored in the client data we mine, so none are shown here.
Where to Farm This Set
4 bosses in Naxxramas and Vault of Archavon drop pieces of this set. Each instance below carries its Adventure Guide entry, where its entrance is, and what each boss drops.
The entrance is in Wintergrasp at 50.1, 11.2 (/way #123 50.1 11.2).
Vault of Archavon entrance
Archavon the Stone Watcher drops 3 pieces of this set (Hands, Legs, Chest) on 25 Player. Adventure Guide map pin: 49.3, 16.9 on the Vault of Archavon map.
Set Bonus
5 pieces of this appearance set also belong to the item set Frostfire Garb, which carries these bonuses in the game files:
2 pieces: Increases the critical strike chance of Fireball, Frostbolt, and Arcane Blast by 5%.
4 pieces: Your offensive spells gain an additional 5% increased critical strike bonus damage.
Versions and Companion Sets
The game links 1 other version to Valorous Frostfire Garb, each labelled the way the collection journal labels it. This page is the 25 Player (Normal) version.