Severe Rainstorm Tuning Device

Increases damage of Severe Rainstorm by 5%.
Decreases Severe Rainstorm skillcooldown by 2 seconds.
[Bonus by Weapon Grade]
[Grade D]: Damage of Severe Rainstorm +7%.
[Grade C]: Physical Damage against enemies of every size +10%.
[Grade B]: Damage of Severe Rainstorm +8%.
[Grade A]: Damage of Severe Rainstorm +10%.