Swarm of Spiders

Source: Harker's Guide to Vampire Hunting

This swarm goes far beyond a natural tangle of spiders. It is an unnatural, magically assembled swarm of horrifying arachnids.

Swarm of Spiders
Monster Level: 2
Large. Beast Swarm
STR	DEX	END	AWR	INT	CHA
-2	3	3	2	-3	0
	Ref: 13	Fort: 13	Ant: 12	Log: 7	Will: 10
Armor Rating 10			Resist Toxic 3, Necrotic 3 Immune Sickened
Hit Points 30			DR 4/AOE
Speed 30 ft, Climb 30 ft			Senses Darkvision 30 ft
Features
Webwalker. The Swarm of Spiders is able to move normally across webbing as well as on walls and ceilings. Webspinner (1/hour). The Swarm of Spiders can create webbing in a 10 ft square. In low-light, this webbing is invisible, requires a DC 16 AWR/Perceiving check to detect, and instantly causes any Large or smaller creature that enters a webbed space to become Restrained (escape DC 13). Swarm. When the Swarm of Spiders is Bloodied, halve the damage that it deals. The swarm can occupy other creatures’ spaces. When another creature attempts to move through a Swarm of Spiders’ space, it treats the space as Difficult Terrain.
Actions
On each of Swarm of Spiders’ turns, it may take one of the following sets of actions. Move and take one Tier 1 action.
Tier 1 Actions
Move. The Swarm of Spiders can move up to its speed. Bite. Reach 0 ft Natural Weapon. +3 vs AR. Hit: 10 (3d4+3) sharp, and make a secondary attack +3 vs FORT. Hit: The target is Shaken until the end of its next turn.