Crossbow Expertise

Benefit: You gain a +1 feat bonus to weapon attack rolls that you make with a crossbow. This bonus increases to +2 at 11th level and +3 at 21st level.
    Also, you ignore partial cover and superior cover with weapon attacks you make with a crossbow.

Published in Heroes of the Fallen Lands, page(s) 311, Heroes of the Forgotten Kingdoms, page(s) 312.