Reward Nibblers are weapons in Xenoblade Chronicles. They are biters wielded by Riki, and can be obtained from high-leveled enemies. They are not otherwise available.
Weapons that have the same effect as the Reward Nibbler for other characters are the Bonus Driver, Bonus Sniper, Reward Defender, Bonus Staff, and Reward Swords.
Note: For any enemy with a listed 0% drop rate, this item can only be obtained using Riki's Yoink!