For each Level of Striking:
Decreases fixed cast time by 0.1 second.

When equipped with Sorcerer Stone(Garment):
Decreases Killing Cloud skill cooldown by 2 seconds.

When equipped with Sorcerer Stone II(Garment):
Increases damage of Earth Grave by 15%.

[iRO Description]
For every level of Striking, reduce fixed casting time by 0.1 seconds.
------------------------
Set Bonus
Sorcerer Stone (Upper)
Sorcerer Stone (Garment)

Reduces skill cooldown of Killing Cloud by 2 seconds.
------------------------
Set Bonus
Sorcerer Stone (Upper)
Sorcerer Stone II (Garment)

Increase Earth Grave damage by 15%.