This chapter contains a few spoilers, so readers should be aware.
Drones can mostly be classified as a Low-level or a High-level varying on its dependence and intelligence.
Low-level drones are instinctually dependent on instructions received from High-level drones, these instructions come in the form of signals emitted by sound waves.
Low-level drones evolve to become High-level drones.
Note: A Low-level drone can never defy a High-level drone.
LOW-LEVEL DRONES
i. Soldier.
ii. Tank.
iii. Siren.
iv. Scout.
HIGH-LEVEL DRONES
i. Pyro-drone
ii. Commander.
iii. Berserker.
iv. Queen.