From SoDWiki

Need to loot an Immaculate Armor piece from named mobs in Thazeran's Tower:

• Immaculate Runic Chain Armor
• Immaculate Runic Plate Armor
• Immaculate Silk Armor
• Immaculate Leather Armor

These can be upgraded by collecting 4 essences from Thaz, one of each element.

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Bard Thaz Armor
Beastlord Thaz Armor
Cleric Thaz Armor
Druid Thaz Armor
Enchanter Thaz Armor
Magician Thaz Armor
Monk Thaz Armor
Necromancer Thaz Armor
Paladin Thaz Armor
Ranger Thaz Armor
Rogue Thaz Armor
Shadowknight Thaz Armor
Shaman Thaz Armor
Warrior Thaz Armor
Wizard Thaz Armor