The "do one damage to get full xp" pet thing wasn't brought in until 2002. Where do people keep getting this idea from?
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Here's a Dev Corner post by Rich Waters explaining the (then new) pet XP changes:
https://everquest.allakhazam.com/story.html?story=960
Pets had
always stolen half xp solo in Classic EQ, right from launch in March 1999. Additionally they are supposed to take a share of xp in groups if they outdamage the whole group.