I was replaying the Witch Queen on legendary and I moticed something odd. Savathun is able to use the Warlocks Nova Bomb and the Hunters Blade Barrage. How is that possible?
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It might also indicate her connection to the Light. It is possible that the Traveler knowing her true intentions knew she would be strong enough to wield all the subclass types at the same time. She is ageless and makes sense for her to develop that mastery over a short period of time. Otherwise people explained it well enough here... A lot of cases where it just isn't clear cut.