Defense Drone

Defense Drones are drones that were used by the team that is deployed on Asteroid X57 for security purposes. The drones are scattered all over the asteroid defending postitions. They are armed with a Mass Accelerator Machine Gun.

During the mission to stop the batarian extremeists, Shepard and the squad encounter these defense drones that have been reprogrammed the batarians, or activated by the facility's engineers to stop the takeover of the asteroid.

Tactics
The drones are encountered in the main facility on X57 and around the asteroid are similar to the Advanced Assault Drones imployed by the Alliance and other governments. Becuase they have a machine gun, whether facing them on foot or in the Mako, keep an eye on your shields, as that machine gun can tear right through them. While you are in combat at the main facility, the drones keep coming, so make sure they stay in cover.

These drones tend to fly around more than other drones that are encountered, so make sure to stay on the move. As with all flying enemies, these droens are immune to most biotic attacks.

There are a few droens that can be combated while you are in the Mako, so the same principal applies as with other drones. If you are going to use the Mako to combat them, then try to use the machine gun rather than the main cannon. As it is hard to get a decent shot with the main gun, using the machine gun or getting out might be a better option.