Increases damage of Basic Grenade, Hasty Fire in the Hole and Grenades Dropping by 10%.
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For each 4 Refine Levels:
Increases damage of Basic Grenade, Hasty Fire in the Hole and Grenades Dropping by additional 5%.
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Refine Level +9:
Increases damage of Basic Grenade, Hasty Fire in the Hole and Grenades Dropping by additional 10%.