I'm level 14 and so far I've collected 184 spinmetal mostly from chests and it looks like Helium Cores will be collecting in the same way as well. My question is what is it used for and is there a way to keep it from becoming a massive pile of something you don't use? Should I stop looking for chests to find green and blue items and just buy stuff at the weaponmaster and Vanguard? It will cut down on $ collecting to buy stuff if I do. This makes no sense to me.
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Upgrading gear will require planetary materials like spinmetal and helium. I wouldn't sweat about having a few hundred yet, as you'll likely use them when you hit level 20 and start buying tower vendor gear.