NPC #22402 (possibly named "Zethgor Quest Credit Marker They Must Burn Tower Forge") doesn't exist. It may have been removed from the game.
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Zeth'Gor Quest Credit Marker, They Must Burn, Tower Forge - Live
Zeth'Gor Quest Credit Marker, They Must Burn, Tower Forge - PTR
Zeth'Gor Quest Credit Marker, They Must Burn, Tower Forge - PTR 2
Zeth'Gor Quest Credit Marker, They Must Burn, Tower Forge - Beta
Zeth'Gor Quest Credit Marker, They Must Burn, Tower Forge - Burning Crusade
Zeth'Gor Quest Credit Marker, They Must Burn, Tower Forge - Wrath of the Lich King
Zeth'Gor Quest Credit Marker, They Must Burn, Tower Forge - Cataclysm