Just follow the instructions in the video. All credit goes to the creator of the video.
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Dumb. Do you even remember the point of the loot cave? It was to farm legendary engrams when nobody had legendary gear. It also had a side purpose of levelling the cryptarch for packages. Both of those can be achieved by farming roc strikes and the chances of blues and legendaries are higher than any loot cave which is full of green rubbish. What are you, level 12?