You can drop the quest from just playing as well. I did the quest through the record book on my hunter a couple weeks ago, but today dropped the abbadon frame or whatever playing strikes on my Titan.
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did u only get nova mortis from your xurs tag?
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You get one than the other. I got both on hunter. Now dropped it on my Titan.
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Yeah I guess you have to get nova mortis first then wait for the rng to drop you abbadon