A model with this special rule re-rolls failed To Hit rolls when shooting any weapon that has the One Use Only special rule. If a model with this special rule is shooting a weapon that has both the One Use Only and Blast special rules, that shot will instead scatter D6" rather than 2D6".
Building an army? Create, validate and share your list with New Recruit, army builder for Warhammer 40,000 7th Edition and many more games.
Try the builder