Not sure precisely so I wouldn't put too much faith in me saying the XP is halved if the pet does over 50% of the damage.
As a necro, do what you do to get a mob down to 18-20% at the point where it flees. Then just pull your pet off and let darkness/dot1/dot2... whatever is remaining do the rest of the work. Rebalance the scales in your favour... or try anyway
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