The third boss you meet in Serpentshrine Cavern is Leotheras the Blind. Well, you could do Morogrim Tidewalker, but he seems to only drop caster-loot. Hunters don't care about that bubble-blowing doofus, so convince your guild to skip him, natch. Leo is where the Tier 5-gear loot flows!
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Another great big Thank You to the WoW Insider editors for allowing us to publish this movie both here and on our little blog at the same time!