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In the Ether Saga world, Nascent Skills provide a whole new level of customization. Once your birthday is selected, these skills become available as your character levels up. Keep in mind that your birthday can be changed by using certain items. Every race/birthday combination results in a different set of Nascent Skills. You get a new Nascent Skill at level 10, 30, 50, and 80.
For more information regarding Nascent Skills, as well as lists for race/birthdays, then check out the wiki page here