Watchspider

Watchspiders (sometimes seen as watch spider) were a breed of huge spider that were raised and trained to obey a master. They were used as guardians by nobles who could afford them, drow, and as familiars by (usually drow) wizards.

Description
These arachnids were a subspecies of huge spider (also known as hunting spiders) that occupied an area about in diameter with a reach of about  beyond that. Their heads and fangs were larger than usual and the rest of their body was built for speed. Those bred in the colder climate of the North had extra hair on their legs and body that was heavy enough to resemble fur. Their eight eyes glittered unblinkingly with intelligence.

Abilities
Watchspiders were fast, both when running and climbing webs or walls. They could leap up to. A single strand of their silk was strong enough to support their weight plus one additional medium-sized creature. If allowed to spin a web, they could know the location of any creature that touched their web. They could be trained to recognize friends or foes and learn simple combat strategies. Some were bred to have a paralyzing venom while others had a venom that sapped the strength of their victims like the well-known medium spider venom. If not resisted, the paralytic effect had an onset time of one to two minutes and then full-body paralysis set in for twenty minutes to over an hour. The victim could see and hear, but not move or speak.

Behavior
In the wild, watchspiders lived alone or in small colonies of two to five members. When hunting, they typically hid in shadows, trees, or their webs and dropped or leaped upon their victims. They could employ pack hunting techniques as well.

Combat
These creatures were trained for guard duty and were taught to stop or slow as many intruders as possible, starting with spellcasters before attacking those with shiny, pointy weapons. They used their excellent eyesight to study their prey and dropped or leaped upon them for a surprise attack, biting each intruder once before moving to the next one, until all were disabled or weakened. They could recognize when weapons were positioned to foil a leap and avoided them. Multiple watchspiders could be trained to work together. They could sound an alarm, coordinate attacks, and even drink a potion from a basin before initiating combat.

Ecology
In their native habitat of tropical Tharsult, watchspiders lived in a web-lined lair but roamed about the surrounding area, hunting to satisfy their carnivorous appetite. This subspecies adapted to the colder climate of western and northwestern Faerûn after many years of breeding, but none have survived north of Neverwinter. By the, they could be found up and down the Sword Coast from Neverwinter to Lantan.

Uses
Watchspiders were bred for intelligence and loyalty and made good familiars, animal companions, and even mounts. They were typically used as guardians of cellars, warehouses, and vaults belonging to rich merchants, guilds, or nobles.