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Growth rates give the chance of a stat increasing when a unit gains a level. A 50% growth rate means a 50% chance of gaining one point in that stat.
Character growth rates and class growth modifiers combine to determine the rate used for a level-up. Classes can add positive or negative modifiers, while Commoner adds none. Mount bonds can provide additional growth bonuses. The character pages list their individual rates; Mu's listed figures include Signs of Growth.
Merge Causality
After Part III's first section, visit the Shrine of Causality in the Obelisk Chamber and choose Merge Causality. Select the character and a main route version, then spend 300 Karma Shards. Recruit and train a character on several routes first to create the versions available to combine.
The result keeps the highest value for each stat across those versions. It does not add their stat totals together. Learned abilities, Combat Arts and skill levels from Parts I and II also carry across.
A merge is most useful when a frequently deployed unit has large differences between versions. Compare the gains before spending shards, since the same currency also buys Boons of Salvation. Talking to a previously eligible recruit in Dagsion during Part III does not require paying for a merge.
See Class Build Routes for possible training paths and Recruitment for the route requirements that create additional versions.