Swarm of Spiders icon: a spider
Icon by Carl Olsen, CC BY 3.0

Swarm of Spiders 5e stat block

Medium swarm of Tiny beasts, unaligned · CR 1/2

Armor Class
12 (natural armor)
Hit Points
22 (5d8)
Speed
20 ft., climb 20 ft.
Challenge
1/2 (100 XP)
Proficiency bonus
+2
STRDEXCONINTWISCHA
3 (-4)13 (+1)10 (+0)1 (-5)7 (-2)1 (-5)
Damage resistances
bludgeoning, piercing, slashing
Condition immunities
Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned
Senses
blindsight 10 ft., passive Perception 8
Languages
—

Traits

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.

Spider Climb. The swarm can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

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 restrictions caused by webbing.

Actions

Bites. Melee Weapon Attack: +3 to hit, reach 0 ft., one target in the swarm's space. Hit: 10 (4d4) piercing damage, or 5 (2d4) piercing damage if the swarm has half of its hit points or fewer.

How many swarms of spiders for a fight?

A swarm of spiders is worth 100 XP. Using the 2024 encounter budgets (SRD 5.2), this is how many swarms of spiders fit each difficulty for a party of four characters of the same level. A dash means even one would be over the budget.

Party levelLowModerateHigh
1st234
2nd468
3rd6912+
4th1012+12+

Budgets add up every monster’s XP, so you can swap some for other creatures of the same total. Try other party sizes and mixes in the encounter calculator.

How the swarm of spiders compares at CR 1/2

Against the 32 other challenge 1/2 monsters in the SRD 5.1, the swarm of spiders has more hit points than 15 of them, which makes it a little frailer than most at its CR. See every CR 1/2 monster.

StatisticSwarm of SpidersCR 1/2 average
Armor Class1212.4
Hit points2220
Best attack bonus+3+4

Similar monsters

Browse: all CR 1/2 monsters · swarms · every monster