I created these guys specifically to backup Sanvill when he confronted my characters.  They are essentially cyborgs – or servitors in Divinity speak – a living brain encased in a robotic body.

Hunter-Killer Servitor 

K9 Fenris Pattern 

Medium Construct (robot, cyborg), neutral 

Armour Class 15 (skymetal plating)
Hit Points 47 (7d8+14)
Speed 50 ft.

Str 17 (+3) Dex 12 (+1) Con 14 (+2)
Int 10 (+0) Wis 6 (-2) Cha 6 (-2)

Skills Perception +5
Damage Resistances bludgeoning, piercing, and slashing from nonmagical weapons that aren’t adamantine.
Damage Immunities force, necrotic, poison, psychic
Damage Vulnerabilities lightning
Condition Immunities charmed, frightened, paralysed, petrified, poisoned, stunned
Senses Darkvision 60 ft., passive Perception 15
Languages understands Gothic but can’t speak it
Challenge 3 (700)

Gift of the Machine God. As a creature of technology K9’s gain many damage and condition residences and immunities but they are also susceptible to electrical attacks.

Keen Hearing and Smell. The K9 has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pack Tactics. The K9 has advantage on an attack roll against a creature if at least one of the K9’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

ACTIONS                                   
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft ., one target.
Hit: 7 (1d8 + 3) piercing damage plus 7 (2d6) plasma (fire and electrical) damage.

Plasma Blast (Recharge 5-6}. The K9 exhales plasma in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 21 (6d6) fire and electrical damage on a failed save, or half as much damage on a successful one.

DESCRIPTION                                   
These wolf like creatures are not true robots but are actually animal brains slaved to a cogitator and placed in a mostly mechanical body.  These are not from the dark-age of technology but are specialised tracking and hunting servitors (cyborgs instead of true robots).