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It's situational. Firefly is really powerful in some situations.
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Oh you meant for PvE I don't play hardly any PvE outside the Raids so I wouldn't know about Firefly
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Firefly works in pvp if people group up close enough. I've gotten double kills with it, but it's pretty situational.
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I only usually use perks that are useful all of the time though, whereas Firefly only becomes useful when enemies hug eachothers shoulders