Your drone gains damage reduction 1/—. This increases to DR 2/— at 7th level and increases by 1 again at 13th level and every 3 levels thereafter.

Your drone is equipped with a thin coating that can change color to match the drone’s surroundings. Whenever your drone stays stationary for 1 round, it gains a +10 bonus to Stealth checks (this bonus doesn’t stack with the invisibility spell or similar effects). If your drone takes any action, it loses this bonus until it once again spends 1 round remaining still.

Your drone gains an energy shield that provides it with a number of temporary Hit Points equal to your mechanic level. This shield remains active until all of its temporary Hit Points are depleted. The drone can replenish the shield’s Hit Points to full by spending 1 Resolve Point when you rest to regain Stamina Points. You can select this mod a second time to double the energy shield’s temporary Hit Points.

Your drone gains a fly speed equal to half its land speed with average maneuverability for up to 10 minutes per day. This duration need not be continuous, but it must be used in 1-minute increments. You can select this mod a second time; in this case, the drone’s fly speed increases to its full land speed, and there is no limit on the amount of time it can fly.

Your drone is equipped with first aid capabilities. If you are reduced to 0 Hit Points, your drone can attempt to administer emergency medical treatment to you, even despite you being unconscious. On subsequent rounds on your turn, your drone takes as many move actions as necessary to return to your side, followed by a standard action to administer first aid. Once it has done so, you can spend 2 Resolve Points to recover a number of Hit Points equal to your mechanic level. Your drone cannot use this mod on anyone but you nor use it if you are dead or have fewer than 2 RP remaining. You can’t benefit from this treatment more than once every 24 hours. Your drone must have the manipulator arms and skill subroutines (with the Medicine skill) mods to select this mod.

Once per day as a standard action, your drone can turn invisible for 10 minutes, as per the invisibility spell. If it makes an attack during this time, the invisibility ends. Your drone can spend 2 Resolve Points to use this ability again on the same day. Your drone must have the reactive camouflage mod to select this.

Choose one type of energy for which your drone already has the resistance mod. Increase your drone’s resistance to that energy type by 5. You can select this mod multiple times. Its effects do not stack. Each time you select this mod, it applies to a different energy type for which your drone has the resistance mod.

Your drone uses basic echolocation to notice unseen foes. The drone gains the blindsense (sound) ability (see page 262).

Your drone gains a burrow speed equal to half its land speed. It can use this speed to move through clay, dirt, earth, and sand. It does not leave a hole behind, nor is its passage marked on the surface.

Choose one of the following skills: Acrobatics, Athletics, Computers, Engineering, Perception, or Stealth. This is a class skill for your drone, and it gains a number of ranks in the chosen skill equal to your class level. Your drone can use this skill when not under your direct control. You can change your drone’s skill unit whenever you rebuild your drone from scratch. Additionally, whenever you are directly controlling your drone, it can use any of your skill ranks if you wish, assuming it has the appropriate tools to do so (a drone without manipulator arms cannot use Engineering to disable a device, for example).