No RNG. Bungie should take the time to make certain things in certain places give you certain guns. Example: beating the raid without dying/on hard would be the only way to ear the mythoclast, the last word and the zombie apocalypse.
English
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There's no RNG for zombie apocalypse... It's a dead orbit gun.
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It's a Crucible* gun and I've actually gotten a void version from RNG
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You need crucible marks to buy it from dead orbit. I got mine through RNG (I actually had more luck with engrams pre-patch) though but I did get my dead orbit rank 2.