Yeah I saw that stuff in my lookings... I found something saying that the air pet used to give you see invis..
I found this which comes up in the google search but the page is no longer reachable
Google search
Quote:
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Once upon a time air pets cast see invis on their owner
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I also recall for a time you "couldn't go in the town with your pet" like a fire pet (same google search):
Quote:
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Once upon a time pets were KOS to mobs and having an invisible pet was (situationally) usefull
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And something from one of the guides I had said to be careful that "people in the towns didn't like you conjuring the dead around them".