Rage does 2 things. #1 it increases your melee damage for each point of rage. #2 the barbarian does not naturally tick cool downs. Rather, when you kill an enemy, your rage value is subtracted from ability cool downs. So a barbarian in a big fight can quickly recover his cool downs by playing aggressively.
 "Me And The Key 2"){kind=icon}
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 "Pyro"){kind=icon}
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 "Realm of the Mad God"){kind=icon}
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Rage does 2 things. #1 it increases your melee damage for each point of rage. #2 the barbarian does not naturally tick cool downs. Rather, when you kill an enemy, your rage value is subtracted from ability cool downs. So a barbarian in a big fight can quickly recover his cool downs by playing aggressively.