Mouse Droid (MSE-6)

Mouse Droid (MSE-6) droid enemy for SWURPG The MSE-6 Mouse Droid is one of the most common security and logistics units in Imperial facilities, starships, and high-security corporate complexes. Small, fast, and easy to mass-produce, Mouse Droids exist to do one thing extremely well: keep the facility running and keep intruders from staying hidden. They patrol corridors, ferry datapads and tools, report maintenance faults, and — most importantly for Game Masters — trigger security escalation the moment something looks wrong.

In SWURPG encounters, the Mouse Droid is not a “combat threat” so much as a tactical problem. Its real weapon is information: it spots movement, hears doors cycle, watches for unauthorized access, and relays alerts to nearby security stations. In stealth missions, a single MSE-6 can turn a clean infiltration into a facility-wide lockdown. In combat, it can convert a chaotic firefight into a coordinated security response as droid patrols converge on the party’s location.

Mouse Droids shine in heists, prison breaks, shipboard boarding actions, and any scene where the environment matters. They create tension without overwhelming low-level parties and give players meaningful choices: destroy it (risk noise), jam it (risk time), spoof it (risk failure), or let it go and deal with the consequences. If your goal is to make an Imperial corridor feel like a living security system, the MSE-6 is one of the best low-DR units you can deploy.

Droid encounters in SWURPG should feel different than “people with blasters.” Droids are built for directives: deny access, neutralize intruders, guard the objective, isolate a target, or hold a corridor until reinforcements arrive. Run Mouse Droid (MSE-6) like a machine with a job — and make the battlefield part of that job: alarms, doors, cameras, lockdown phases, and patrol loops.

Recommended Level Range: 1-2 | Difficulty Rating (DR): 0.25

Mouse Droid (MSE-6) Stat Block (SWURPG)

Mouse Droid (MSE-6)

Difficulty Rating (DR): 0.25
Type (Size): Droid (Tiny)

Initiative: +4
AC: 14 (Compact Plating (light durasteel shell))
HP: 4 (1d6)
Speed: 20 ft.

Shields: Recharge: none

Attributes:
STR 6 (-2), DEX 14 (+2), INT 6 (-2), WIS 12 (+1), CHA 5 (-3)

Saves: DEX +4, WIS +3

Skills: Perception +3, Stealth +4, Use Computer +2

Languages: Binary, Understands Basic (cannot speak)

Traits:
Ion Vulnerability. The MSE-6 has Vulnerability to ion damage. If it takes any ion damage, it must succeed on a DC 10 WIS saving throw or become Disabled (incapacitated, speed 0) until the end of its next turn.
Facility Messenger. If the MSE-6 can reach a wall panel, console, comm junction, or door control within 30 feet, it can transmit an intruder alert as a Bonus Action. Until the end of the next round, allied security units have Advantage on Perception checks to locate intruders in the same zone.
Low Profile Chassis. The MSE-6 can move through the space of any creature and can squeeze through gaps as small as 6 inches without slowing. It has Advantage on Stealth checks while in dim light, smoke, crowds, or cluttered corridors.
Wired Into the Corridor. The MSE-6 has Advantage on Perception checks made to detect doors opening, bootsteps, blaster discharge, and other security-relevant sounds within 60 feet, even through walls.

Actions:
Shock Probe (Utility) (Melee Weapon Attack) : +4 to hit, range/reach 5 ft, one target. Hit: 3 (1d4) energy damage
If the target is a living creature, it must succeed on a DC 10 CON saving throw or be Shaken until the end of its next turn. Droids are unaffected by this rider effect.

Mouse Droid (MSE-6) in Play

Mouse Droids avoid direct confrontation and behave like machines with a directive: detect anomalies, report them, and survive long enough to deliver the alert. They patrol predictable routes, pause at door junctions as if “listening,” and immediately scuttle toward wall panels or comm junctions when they suspect intruders.

In play, run the MSE-6 as a pressure timer. On its first turn, it attempts to Hide or break line of sight, then uses Facility Messenger to broadcast an intruder warning. If cornered, it uses Scuttle and Hide to disengage and flee toward reinforcements. If the party ignores it, the next scene should change: doors begin to seal, lights shift to alert mode, and security units begin sweeping the area. The Mouse Droid’s job is not to win the fight — it’s to make the facility start fighting back.

Adventure Hooks Featuring Mouse Droid (MSE-6)

Corridor Whisper Network: The party infiltrates an Imperial star destroyer using stolen codes, but Mouse Droids are passing messages faster than the heroes can move. Each time an MSE-6 escapes, the ship adapts — patrol routes change, doors lock, and security droids begin searching with surgical precision.
The False Alarm Gambit: A rebel contact asks the party to stage a controlled ‘intruder event’ using an MSE-6 to lure security teams away from a vault. The challenge is making the alarm believable without triggering a full lockdown that traps everyone inside.
Sabotage in the Service Tunnels: A corporate facility’s power failures are blamed on “rodents,” but the real culprit is a rogue Mouse Droid swarm rerouting energy and locking staff out of critical systems. The party must navigate maintenance shafts while tiny droids trigger alarms and slam blast doors.
Prison Break: Alarm on Wheels: During a detention-block escape, a single MSE-6 spots the party and begins racing toward the central security hub. If it reaches the hub, the prison enters hard lockdown and releases suppression droids into every corridor.
The Quiet Package: A Mouse Droid is found carrying encrypted data between officers — and it keeps doing its route even after the base changes hands. The party can follow it to uncover a hidden safe room, but the MSE-6’s transmitter is still tied into Imperial response protocols.

To explore more droid threats, return to the Battle Droids & Security Units index and expand your roster with additional patrol units, assassin frames, enforcer models, and facility guardians.