This skill raises the rate of regeneration of Mana and Health. This skill is not noticed in battle as the regeneration is slow and constant, but if one were to look at the effects through the whole day it made a substantial change.
The second skill learned by Mihee when she was fighting with Hansoo in the tutorial. She traded a few runes for this skill as Hansoo was the original owner, but decided not to learn this skill due to his trait <Seven Stars>, and possibly because he knew about the Mana Pool Surgery offered in the yellow zone.
Effect: Increase Mana and Health regeneration