If this is about Stoneskin:
Stoneskin caps at (Skill/3)+MND >= 177, so GEO/RDM needs 129 MND. Which is easily obtainable at 99.
Assuming you want to give GEO an E rank Enhancing skill, you only need 77, which is about the same as a GEO/RDM has without any merits, gear or buffs.


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