Gem of Knowledge only gives bonus experience if you kill a unit (you, not summoned units like towers, teammates, skeleton scroll summon), and it's a flat amount based on what unit it is. So two heroes, with two gems, won't both get bonus experience, if I remember correctly. Just the guy that properly last hits. I'm working on ITT tomorrow, I'll confirm #s then PL0X Forum Suggestions 06:20, 8 May 2009 (UTC)

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