This is my own personal Helium run. Its not the fastest or most efficient, but I average about 25-35 Helium per 10 minutes. Check it out. I hope this video can help. If it does good, I will post all planets material farm guides.
http://m.youtube.com/watch?v=xKINcbbEj1Y -- Spirit Bloom Farm Guide (Fast)
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This should help with the exotic sword