I still don't know how to turn this event into a heroic one, all others seem really easy to learn but since launch this one has evaded me? (yes i am stupid)
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Move into one of the domes the small blights make, you'll get a buff. Move out of the dome and shoot the large blight until the buff runs out. Rinse and repeat until the large blight is dead. Heroic event will then activate. The taken that spawn around the small blights are annoying, so you may have to clear those out once in a while.