Tier set

Tier sets, often shortened to simply tier, are class-specific armor sets that traditionally drop in raids. Tier added since patch 9.2 can also be obtained by converting other equipment at a catalyst. These sets offer powerful set bonuses and a unique visual appearance for each class.

The related term raid tier describes a group of raids that drop loot around the same item level. Tier sets may be spread across different raids within the same raid tier; for example, the shoulders may drop in one raid and the chestpiece may drop in another.

List of tiers

Note: Raid tiers marked with an asterisk (*) had no actual armor sets. Instead, they had collections of armor that formed transmog sets—one for each armor type. They are included here for the sake of completeness.

Expac	Tier	Set source
	Tier 1	Molten Core
	Tier 2	Blackwing Lair
	Tier 3	Black Market Auction House (retail) Naxxramas (Classic Era)
	Tier 4	Karazhan Gruul's Lair Magtheridon's Lair
	Tier 5	Serpentshrine Cavern The Eye
	Tier 6	Battle for Mount Hyjal Black Temple Sunwell Plateau
	Tier 7	Naxxramas Obsidian Sanctum
	Tier 8	Ulduar
	Tier 9	Crusaders' Coliseum vendors 25-player Trial of the Crusader to buy higher ilevel
	Tier 10	Icecrown Citadel
	Tier 11	Bastion of Twilight Blackwing Descent Throne of the Four Winds
	Tier 12	Firelands
	Tier 13	Dragon Soul
	Tier 14	Terrace of Endless Spring Heart of Fear
	Tier 15	Throne of Thunder
	Tier 16	Siege of Orgrimmar
	Tier 17	Blackrock Foundry
	Tier 18	Hellfire Citadel
	Tier 19	The Nighthold
	Tier 20	Tomb of Sargeras
	Tier 21	Antorus, the Burning Throne
	Uldir sets*	Uldir
	Dazar'alor sets*	Battle of Dazar'alor
	Palace sets*	Eternal Palace
	Ny'alotha sets*	Ny'alotha, the Waking City
	Nathria sets*	Castle Nathria
	Sanctum sets*	Sanctum of Domination
	Tier 28	Sepulcher of the First Ones
	Tier 29	Vault of the Incarnates
	Tier 30	Aberrus, the Shadowed Crucible
	Tier 31	Amirdrassil, the Dream's Hope
	Tier 32	Nerub-ar Palace
	Tier 33	Liberation of Undermine

Notes

• Many tier sets have 5 pieces that count toward their set bonus, plus some additional pieces that do not. These extras are referred to as "off-set" pieces among players.