Behavioral Inhibitors
Droids (except 4th-Degree Droids) cannot intentionally harm a sentient living being or knowingly allow a sentient living being to be harmed. Furthermore, all Droids must follow orders given to them by their rightful owners, as long as those orders do not require the Droid to harm a sentient living being. Droids with Heuristic Processors can sometimes violate these restrictions by creatively interpreting their behavioral inhibitors.
Ion Damage Vulnerability
As electronic constructs, Droids are vulnerable to damage from Ion Weapons. Generally, Ion Damage has the same effects on Droids that Stun Damage has on living beings.
Maintenance
Droids do not sleep, eat, or breathe. However, they do need to enter shutdown mode and recharge for 1 hour after 100 hours of operation. If a Droid fails to do so, it must make an Endurance check each hour (DC 10, +1 per additional hour after the first) or move -1 Persistent step along the Condition Track. This Persistent Condition can only be removed by the Droid recharging for 1 hour.
Memory
A Droid's Trained Skills, Feats, and Talents can be reassigned with the Use Computer skill (see Reprogramming). A Droid hero can use its own Use Computer skill to perform this Reprogramming, but it takes a -5 penalty on its skill check. If a Droid is ever subjugated to a complete Memory Wipe, it becomes a basic model of its type, losing any levels and abilities gained.
Nonliving
A Droid is immune to Poison, Disease, Radiation, noncorrosive Atmospheric Hazards, Vacuum, Mind-Affecting effects, Stunning effects, and any other effect that only works on living targets. Droids have no connection to The Force and cannot gain the Force Sensitivity feat, or learn Force Powers.
Droids do not have a Constitution score, so they do not get bonus Hit Points for having a high Constitution, and they apply their Strength modifier to their Fortitude Defense. Unlike living beings, Droids do not "Die," but they can be disabled or destroyed. Droids do not gain an ability bonus to Constitution-based Skill Checks and may not take Feats or Talents with a Constitution prerequisite.
If a Droid is reduced to 0 Hit Points, it is disabled and cannot be reactivated until it is repaired so that it has at least 1 Hit Point. If the attack that reduced the Droid to 0 Hit Points also exceeds the Droid's Damage Threshold, the Droid is destroyed instead. A destroyed Droid cannot be repaired or salvaged.
Repair
Droids can regain lost Hit Points only through the use of the Mechanics skill (see Repair). A Droid can use this application to repair itself, but it takes a -5 penalty on its skill check.
Shut Down
A Droid that is Shut Down can take no actions and is effectively unconscious. Shutting down a willing Droid is a Standard Action. Shutting down an unwilling Droid is more difficult, requiring you to Grab the Droid, and then make a Mechanics check (DC = Droid's Will Defense) as a Standard Action while its Grabbed. You cannot shut down an unwilling Droid with Locked Access unless it is disabled or otherwise Helpless.
Skills
Droids normally cannot use any Skill Untrained except for Acrobatics, Climb, Jump, and Perception. A Droid with a Heuristic Processor ignores this limitation.
Systems
Droids can have many of their characteristics changed by installing or replacing existing Droid Systems.
