Rustshards can be gotten from the High Rank Volcano, and you can turn them into cool weapons with dragon element! Finding various types of shards is pretty much the only way to get these weapons, and it requires a lot of luck to get the weapon that you want.
My method of farming Rustshards is in the high rank volcano. It usually takes about 6-7 minutes if you’re fast and I usually end up with about 2-3 Rustshards per run.
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