---
title: "Clacking Sea Skull Swarm"
obsidianUIMode: preview
noteType: pf2eMonster
cssClasses: pf2e
aliases: "Actor.Y9YVhbqJ8RtiAKkU" 
tags:
  - pf2e/creature/type/evil
  - pf2e/creature/type/mindless
  - pf2e/creature/type/swarm
  - pf2e/creature/type/undead
  - pf2e/creature/type/unholy
  - pf2eMonster
  - pf2e/creature/level/10
statblock: inline
name: "Clacking Sea Skull Swarm"
level: 10
license: OGL
---

```statblock
columns: 2
forcecolumns: true
layout: Basic Pathfinder 2e Layout
source: "Pathfinder Bestiary 3"
name: "Clacking Sea Skull Swarm"
level: "Creature 10"

alignment: ""
size: "Large"
trait_01: [[evil]]
trait_02: [[mindless]]
trait_03: [[swarm]]
trait_04: [[undead]]
trait_05: [[unholy]]
modifier: 18
perception:
  - name: "Perception"
    desc: "+18; Darkvision"
languages: ""
skills:
  - name: "Skills"
    desc: "Acrobatics: +19"
abilityMods: [-3, 3, 4, -5, 2, 4]
speed:  swim 25 feet
sourcebook: "_Pathfinder Bestiary 3_"
ac: 29
armorclass:
  - name: AC
    desc: "29; __Fort__ +20, __Ref__ +19, __Will__ +16"
hp: 120
health:
  - name: ""
  - name: HP
    desc: "120, void healing; __Immunities__  death effects,  disease,  paralyzed,  poison,  precision,  unconscious,  mental,  grabbed,  prone,  restrained; __Weaknesses__ area damage 10, splash damage 10; __Resistances__ bludgeoning 5, cold 10, electricity 10, fire 10, piercing 10, slashing 10"
abilities_top:
  - name: ""

abilities_mid:
  - name: ""
  - name: "Boneshard Burst"
    desc: "  When a clacking skull swarm is reduced to 0 Hit Points, it erupts in an explosion of foul energy and bone fragments in a 30-foot burst, dealing 2d12 piercing damage and 2d12 void damage (DC 29 Reflex check save)."

  - name: "Chattering Teeth"
    desc: " (arcane,auditory,aura,emotion,incapacitation,mental) 60 feet. A clacking skull swarm emits a cacophony of chattering. A creature entering or beginning its turn within the area must succeed at a DC 29 Will check save or become [[Conditions/Confused|Confused]] for 1 round. A creature that successfully saves is immune to that swarm's chattering teeth for 24 hours. The swarm can stop or resume this ability as a free action."

  - name: "[[Bestiary Ability Glossary/Void Healing|Void Healing]]"
    desc: "  A creature with void healing draws health from void energy rather than vitality energy. It is damaged by vitality damage and is not healed by vitality healing effects. It does not take void damage, and it is healed by void effects that heal undead."

attacks:
  - name: ""

  - name: "Shrieking Scream"
    desc: "`pf2:2` (auditory,emotion,fear,mental) The clacking skull swarm emits a terrifying, painful scream that deals 10d6 sonic damage to all creatures in a 30-foot cone (DC 29 Will check save). A creature that fails this save is also [[Conditions/Frightened|Frightened 1]] ([[Conditions/Frightened|Frightened 2]] on a critical failure).\n\nThe swarm can't use Frightening Scream again for 1d4 rounds."

  - name: "Swarming Gnaw"
    desc: "`pf2:1`  Each enemy in the swarm's space takes 4d8 piercing damage (DC 29 Reflex check save)."
 
```

```encounter-table
name: Clacking Sea Skull Swarm
creatures:
  - 1: Clacking Sea Skull Swarm
```



Roiling about in seething waves of bleached death, clacking skull swarms arise from the remains of dozens of beheaded humanoids. The horrible clattering of the skulls' onslaught drives their prey to distraction even while they try to flee in terror.

* * *

A skull swarm is composed of reanimated masses of craniums and jawbones, forming a terrifying avalanche of undead fury. Most skull swarms are mindless, though some retain a vestige of wit, awareness, and even magical talents from life, culminating in a highly intelligent swarm mind.
