Increases the damage multiplier in the formula [Skill Level x4 + Remaining SP/100] for [Asura Strike] by 2.
Increases the [Hell Gate] multiplier by 50%. Every +1 refining increases the [Hell Gate] multiplier by 20%.
When refining reaches +5, gain Max SP +5%. When refining reaches +10, gain Max SP & Max HP +5%. When refining reaches +15, gain Atk +5% and Damage to L-size Monsters +15%.
Starting from refined +8, every +1 refining increases Max SP by 2% (up to 16%).