The catalyst in the Patterns & Catalyst Section is bugged for the Vexcaliber. No matter how many times I reshape my vexcaliber or which of the three catalysts I insert it never progresses. I even shaped new vexcalibers with the catalysts and nothing. Plz fix
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While you have your Vexcaliber EQUIPPED go to the enclave and craft a second Vexcaliber WITHOUT a catalyst. It should unlock it for you.