Balius parts were pieces of machinery were made by Moebius Corps in order to make repairs to their experimental Archangel the Balius. When General Carolina Davis and two allied commanders raided the facility, they gathered these parts, allowing them to reactivate the Balius and turn it against the facility's hybrids.
Balius parts are the objective of the map Part and Parcel. After collecting 70, the Balius will move toward a Moebius hybrid, breaking its cell and initiating the boss fight. Parts crates and defense bots drop one part, while xenon generators and sigma engines drop five parts.