Increases Basic Grenade, Hasty Fire in the Hole and Grenades Dropping damage by 10%.
Increases Basic Grenade, Hasty Fire in the Hole and Grenades Dropping damage by additional 5% per 4 refine rate.
If refine rate is 9 or higher, increases Basic Grenade, Hasty Fire in the Hole and Grenades Dropping damage by additional 10%.