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There are two types of Perfect Locks: Lesser Perfect Locks, and Greater Perfect Locks.
Lesser Perfect Locks use a yellow icon upon activation and turn all Greats into Perfects for a certain duration.
Greater Perfect Locks use a red icon, and turn both Greats and Goods into Perfects for a certain duration.
This page only lists Greater Perfect Locks.
Note: all data is given for level 1 skills.