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So, EXP is usually 10-50-ish per kill, right? In most cases, you won't get enough EXP that the bonus is greater than 1 EXP. Which leads me to believe that the amount is floored, so you gain no bonus EXP. I've noticed that when laning with another champion and having 2/4 of Awareness, I leveled at the exact same rate as the other three champions in the lane, up to level 8. Unless they all had 2/4 Awareness, too, something is probably wrong.