Terrible Cave Path
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On https://classicwow.live/leveling/alliance/duo/human/warlock/human/priest?section=36&step=10 you have to go through the Terrorweb tunnel, which has a 60 elite running through it, and many nerubians that deal a lot of damage with the crypt scarabs. It's an absolutely terrible path to get back to Tirion, and ends up with more time wasted and more potential death than just going around the mountain range in the middle of the plaguelands.