Nanonot Swarm

Invasive micro-machines with the ability to regenerate and also to reconfigure other technology, individual nanobots are all but invisible. Ion attacks can disrupt and destroy them, and they are unable to penetrate force fields of any strength. Their radio signals can be jammed, in which case they have a back up light-pulse system that renders them visible in infrared, where they look like a swarm of Procyon fireflies. 

Nanobot swarms require sustenance in a way, and are attracted to the CPUs of powerful computers which they will drain of CPU cycles in order to recharge themselves.

Nanobot Swarm

Medium semi-sentient mechanoid swarm (4d6)    
STR 1 (1d6) AGI 15 (5d6) END 15 (5d6)INT 6 (3d6) LOG 1 (1d6) WIL 1 (1d6)CHA 1 (1d6) LUC 1 (1d6) REP 6 (3d6)
MELEE DEFENCE 10RANGED DEFENCE 10MENTAL DEFENCE 20VITAL DEFENCE 20
HEALTH 15SOAK 5; VULN 1d6 electricity, 2d6 ionIMMUNE all non-area attacks
INITIATIVE 4d6PERCEPTION 3d6FLY+ 8; CLIMB -; JUMP -CARRY -
REACH -ACTIONS 2                                     
🅥 Swarm (special)    
Skills reactions 1 (1d6)

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Swarm. A swarm is immune to all attacks except for area attacks. When it attacks, it simply moves into the target's square. Any creature which starts its turn in or enters the insect swarm's square suffers 1d6 piercing/electricity damage automatically. Swarms can move through gaps of any size.
Variable size. Swarms can be of any size. The stats above are for a medium-sized swarm. For each size category larger, the swarm gains +1d6 to damage (i.e. an enormous-sized swarm does 3d6 damage).