No too overpowered. Maybe if you could only use them on weakened enemies it would be fair.
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So backstabber is op?
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What? You're argument doesn't make sense. That's like saying 'in PvP, every class should be able to make a defender bubble, because it isn't overpowered.' Backstab, like the defender bubble, is a class-specific skill with a cooldown on it. Just because it isn't overpowered, that doesn't mean it should be distributed to every character in the game, at no drawback.