The froglok's are few and far between in the area that he roams. There's one or two that path right in front of the giant camp but easy to avoid. You can follow the cliff to the wall, then the wall all the way to the northern corner.
Maybe 1 out of 10 drovlargs see invis, if not less, and they have a small aggro radius.
It's not nearly as dangerous as it seems even without invis if you pay attention to your surroundings and just keep moving.
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