The answer to your question is Orc due to their berserk ability.
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Yeah that seems like the popular answer. What about Nords and their Battle Cry ability?
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Battle cry is shorter than berserk's effects
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It may be shorter but is meant to cause the enemy fear and flee. You don't think the Orc will flee?
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Well depends. Are we basing this on the game, in which its level based, or if it was a fantasy universe, in which it depends on the constitution of said Orc. Seeing as how orcs live in little reservations in skyrim, and the previous games just made most of them seems more timid (a once powerful proud race crushed by the other more grouped races) that most orcs would flee as means of survival instinct.
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The Latter. The Battle Cry would simply test the fortitude and courage of the Orc