Galbrok Spider Swarm

A misfiring set of Nanites, controlled by Galbrok's infernal machinery. Powered by the infamous Galbrok Tamarinds, they have been thoroughly corrupted by the power of Shayna and The Necrodruid.
Having assumed the form of tiny spiders (Galbrok is unaware the nanites can assemble into anything they are ordered to), the nanites act and are treated as a sort of "perfect slave". Galbrok is not even aware of how they work, entirely, but they follow orders and do their jobs, so he asks no questions.

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Swarm of Spiders

Medium swarm of tiny beasts, unaligned

Armor Class 12

Hit Points 22 5d8

Speed 20ft Climb: 20ft

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STR

3 -4

DEX

13 +1

CON

10 0

INT

1 -5

WIS

7 -2

CHA

1 -5

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Damage Resistances bludgeoning, piercing, slashing

Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned

Senses blindsight 10 ft., passive Perception 8

Challenge 1/2 (100 XP)

Spider Climb. The swarm can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny insect. The swarm can't regain hit points or gain temporary hit points.
Web Sense. While in contact with a web, the swarm knows the exact location of any other creature in contact with the same web.
Web Walker. The swarm ignores movement restirctions caused by webbing.

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Actions

Bites. Melee Weapon Attack: +3 to hit, reach 0 ft., one target in the swarm's space. Hit: 10 4d4 piercing damage, or 6 2d4 piercing damage if the swarm has half of its hit points or fewer.