mage pets were known for that
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funniest thing that happened to me about that:
Areana near 3rd gate in neriak, i played arround with a lvl 20ish monk friend, that wanted to attack my pet (49 fire, staff focused). So we been playing arround a bit ... i kept calling pet back off so he doesnt die, and all of a sudden it did not listen anymore! So we zoned it off ...
think we are done? nohoooooo that pet had reso burnout 3 and so on, and it stayed up!!! Killing everyone that wanted to go to neriak 3rd gate ... later on i had to get a necro friend of mine to team up with me to kill the pet, and it almost anihilated us both still ><