I went to just upgrade the power on a weapon from 200 to 303 and the game wanted 1,643 UBSTABLE CORES. Are you out of your flippin minds? Keeping my gear up to level with my drops should be CHEAP. This is so ridiculous.
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Farm the gear with the same name. With the new system, it’s pretty much guaranteed especially it you are using new gear. It will cost you only glimmer and allow you to save the unstable cores in the process.