To expand on this a bit, only the cross mod can have a potency primary, but it can be any set, including potency.
to expand a bit more, you cant have the same stat as primary and secondary at the same time, so you'll never see a speed arrow with speed secondary, or a crit chance triangle with crit chance secondary or offense% square with offense % secondary (it can have flat offense but not the same offense %)
To expand on this a bit, only the cross mod can have a potency primary, but it can be any set, including potency.
to expand a bit more, the thing that you can have is the same stat as primary than secondary, so you'll never see a speed arrow with speed secondary, or a crit chance triangle with crit chance secondary or offense% square with offense % secondary (it can have flat offense but not the same offense %)
To expand a bit more, the primary stat on the mod has nothing to do with the mod TYPE/SET, so you can have a Potency-set cross with Potency primary, or Potency-set (non-cross) with Potency% secondaries.
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To expand on this a bit, only the cross mod can have a potency primary, but it can be any set, including potency.
to expand a bit more, you cant have the same stat as primary and secondary at the same time, so you'll never see a speed arrow with speed secondary, or a crit chance triangle with crit chance secondary or offense% square with offense % secondary (it can have flat offense but not the same offense %)
To expand a bit more, the primary stat on the mod has nothing to do with the mod TYPE/SET, so you can have a Potency-set cross with Potency primary, or Potency-set (non-cross) with Potency% secondaries.