At +10 that is refinement, you may choose a Hidden Potential. Most weapons only have one choice, but a few may have more than one. From the time you reach 12 star weapons, these abilities can be PSO2 Meseta extremely powerful and some could even out course 13 star ones. Elder Rifle for example provides a 30% ranged damage bonus so long as you have moved in the last moment or Sigma Fagan's...
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