Banquet Biters are unique weapons in Xenoblade Chronicles. They are biters wielded by Riki, and can be obtained from numerous high-level enemies. They are not otherwise available. As a Unique Weapon, it is similar to Melia's High Entia Soul, giving the player three free gems with which to improve status effects.
Sources
Enemy drops
Note: For any enemies listed with a 0% drop rate, the item can only be obtained using Yoink!