A lot of people probably already know this but i'll post it anyway. If you are having trouble doing the weekly heroic or nightfall on Ishtar Sink, just hide below the platform to the right of the "Achron Egg". Watch the video if you don't know what i'm talking about.
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Works just swell - I solo'd the nightfall and heroic on hard lvl 28 with this strategy. Having the icebreaker helped too. Thanks Xur! Suck one "earners"!