I honestly believe that Ergo Sum should be able to be crafted, it would save us a lot of space in the Vault.
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Craft-able no, focusable perk option? Yes. As it is it’s a 1 in 1500 to get the perfect desired roll from blade, guard, perk, and frame when also factoring in void, arc, and solar. Focusing the perk you want would alleviate some of that headache of running Paleheart until your nipples bleed. I also wouldn’t be against Xur selling random rolls once in a while.