Dragon Ball Xenoverse: Best New OP Z-Soul [DLC]
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You can get this Z-Soul from the new PQ "Small but strong". No reqs just do the PQ until you get it.
Soul is called "Might as well" you need the new DLC in order to get it as a drop.
Analysis for the Ki regen and Stamina regen aspects of the soul, not the stats or the speed bonus. Only the regens.