You know when you kill an Eye of Riven in the raid, pick up the weapon they drop and turn "Taken". Yeah, that's what it should have been. The ability you use to free someone who's captured during the Morgeth encounter could be a one hit kill you're only able to use once. Just an idea.
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That would have been pretty cool but I'm not sure about the one use weapon tho - plus it might be damn near impossible to spot them at times.
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I actually wouldn't mind that. Sounds fun.