From Portals of Phereon Wiki

A genetic trait unique to Lonada. It greatly increases Mana Growth but completely cripples Strength Growth. Great for spellcasters and mana batteries who don't need Strength anyway. It only takes effect on level up and doesn't apply retroactively.

Also see Intelligent, Arcane and Generalist, though the latter is circumstantial.

Also see Weak.

Appears to be broken in version where it's still doing the old 50% increase to Mana instead of increasing Mana Growth.