I don't really see a point in GM Nightfalls.
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If they were more rewarding then yes they would be worth it but they aint. The rewards should be as follows: 1x random fully masterworked legendary armor piece. 1x random fully masterworked legendary weapon that spawns with top tier perks. The weapons should never have useless perks. The random piece of exotic gear with high stat rolls. 10x enhancement cores 5x upgrade modules 2x prisms 1x ascendant shard. If that was a guaranteed reward for master nightfall it would be worth the time.