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So I understand that blight grenades are defensive grenades, which prevents enemies from gaining the melee bonus from a charge, so is that their only use or can I use blight grenades for anything else? Im asking because I dont have access to a codex and my only reference to units and such is the information on battlescribe, and I can't seem to find any stats (strength, ap, etc) on blight grenades.

Look up defensive grenades in the rulebook

Dakka isn't a replacement for a rulebook