It would definitely add the need for a Warlock, but it would obligate those who play the Warlock class to do something they may not want to do(revive), what if just they want to do damage at the same time playing a Warlock.
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I guess that makes sense. What if it were a focus then?
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Well, I hope you have patience when finding someone who has a Warlock and a revival focus
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Hahaha yeah, I get where you are coming from!