Robotic units are mechanical in nature and for the most part constructed with Alien Alloys, making them immune to poison (e.g. Gas Grenade), fire (e.g. Flamethrower), Flashbang Grenade, and most psionic attacks (see below).
While Robotic units are also Stun Immune and cannot be captured for interrogation research, a Drone can be affected by an Arc Thrower and controlled during a mission if the Drone Capture project is researched at the Foundry.
However, due to their 0 Will attribute, Robotic units are highly susceptible to Psi Lance and Rift attacks. They are also subject to the +40 Defense bonus conferred by a Psionic class soldier's Telekinetic Field.
Although immune to fire damage, Robotic units are still susceptible to damage from nearby explosions in the environment (e.g. a car or gas pump), and explosive weaponry such as grenades and rocket launchers.
In addition to capturing and using a Drone, XCOM's weapon platforms can be healed by:
- An Arc Thrower upgraded with the S.H.I.V. Repair Foundry project.
- The Sentinel Drone EW Foundry project, which automatically repairs 2 HP per turn.