Hill Giants, Sand Giants, and Ice Giants all saw through invis in classic. As a Wizard, I was usually invisible while medding or running through zones, and I spent a good ten levels in Rathe Mountains. Giants seeing invis was the reason I never used auto-run in Oasis or Rathe.
Then there were the two Ice Giants guarding the entrance to Permafrost. I remember getting into Permafrost the front way was always scary, because invis didn't protect you from them. You had to run right down the center and pray neither aggro'd.
The crazy thing about Kunark was the Forest Giants didn't see through invis. It allowed me to run around in their forts with impunity. But yeah, tons of stuff in Kunark saw through invis - it didn't change any of the old world mobs, though.
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