After reading all the flaming posts about the treasure cave, I just had to help share this video if you havn't seen it already. This is by far much more effective then the loot cave. You don't have to compete with other players, there are more mobs, and many more engrams! Been doing this for a couple days now, and have pulled over 20 legendary engrams. Not to mention literally hundreds of blues. I've done both farming methods, and this is by far better, more effective, and most of all....FUN! ENJOY!
[url]https://www.youtube.com/watch?v=VIEiCU0BtiU&list=UUM_FGxgszw3Mo_fY51s4efw[/url]
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Maybe I'm wrong but...they made a patch for this! If your team wipes (or in this case a person solo wipes) legendary engrams can't immediately drop for a few minutes. This has been my experience as well! No legendary drops after first wipe.