Currently it means that they will penetrate armour (Essentially adding 100-300 damage to an attack). You could remove it off an enemy currently by attacking him twice.
With the pending update for next week, advantage will change to give the user 100% critical chance on his next hit.
The significance of Critical-Utopian Socialism and Communism bears an inverse relation to historical development.
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With the pending update for next week, advantage will change to give the user 100% critical chance on his next hit.