In Eq1, if a Necromancer killed a mob and didn't inflict any direct melee or spell damage, and just allowed the pet to kill, there would be an experience penalty.
Imacollata L'Haine. 80th Level Necromancer. Officer of <Unified>. RunnyEye Server.
In the later years of EQ1 there was no such thing in existence. At least when I played I never had to worry about it. So if there was a thing like this I'm glad it was before my time.