Warcraft Secrets on X: "Cobalt Assembly leveling has been stealthily nerfed by around 80% less xp. This is a disappointing nerf, god forbid us helping friends level up quickly in 1 hour.
I believe the 'cobalt assembly' xp farm finally got nerfed today - General Discussion - World of Warcraft Forums
Chevrolet Cobalt Rack And Pinion Assembly
The Cobalt Assembly Nerf! - Grahran's WoW Gold
Cobalt Assembly Level Boost - Buy on GladiatorBoost
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Power Leveling via Cobalt Assembly - Grahran's WoW Gold