Yeah, I am not sure how that multiplier works exactly. If you have 2 people in the group, 4x modifier for group, then I'd assume it would be like 2x solo? Then with 4 people it would be like 1x solo? On some servers it seems like if you have 4 people in your group, you get even more experience than with 2 people killing the exact same mob. Others it seems to decrease with additional members.
On live is was slightly different, with there being a growing experience bonus per additional groupmate, though still decreasing experience gained per kill per person even with a full group and solo always providing the highest experience per kill.
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