Arcane Anomaly, Chalk Chatterling

Family: Arcane Anomaly

Small construct, unaligned

Armor Class 12
Hit Points 22 (5d6 + 5)
Speed 25 ft., fly 25 ft.

5 (–3) 15 (+2) 12 (+1) 4 (–3) 10 (+0) 7 (–2)

Damage Immunities poison
Condition Immunities charmed, exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained
Senses darkvision 60 ft., passive Perception 10
Languages — (seems to speak, but it’s gibberish)
Challenge 1/2 (100 XP)
Proficiency Bonus +2


  • Death Burst. When the chalk chatterling dies, it explodes in a burst of dust. Any creature within 5 feet of the chalk chatterling must succeed on a DC 11 Constitution saving throw or be blinded until the end of its next turn.
  • Distracting Chatter. Any creature that starts its turn within 30 feet of and able to hear the chalk chatterling must succeed on a DC 11 Wisdom saving throw or be unable to cast or maintain concentration on a spell. Constructs and undead are immune. A creature who intended to cast a spell can choose another course of action.
  • Water Weakness. If the chalk chatterling is doused in water or ends its turn submerged in water, the chalk chatterling takes 3 (1d6) acid damage. Maximize this damage if the water is soapy.


  • Dust Whip. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) slashing damage.
  • Maddening Chatter (Recharge 6). Each creature within 30 feet of and able to hear the chalk chatterling must make a DC 11 Wisdom saving throw, taking 7 (2d6) psychic damage on a failed save, and half as much damage on a successful one. Constructs and undead are immune. A creature that fails the saving throw can’t take reactions until the end of the chalk chatterling’s next turn.


Careless Magic. The Arcanist Inquisition contends that all magic is dangerous, not just that wielded by demons and nefarious sorcerers. Their blanket denunciation of all mages might be harsh, but their zealous belief in the perils of magic isn’t unfounded. Even a well-meaning mage can invite catastrophe with a slip of the tongue, a misaligned gesture, or momentary lapse in concentration.

Arcane anomalies, as some mages euphemistically call them, are one such product of careless magic. Ritual objects used in particularly powerful spells, when not disposed of properly, can gain a malevolent sentience.

Many an apprentice has learned the hard way that “Go wash up!” is not only a chore, but an essential safety practice. As one might imagine, water is a particular weakness of all arcane anomalies.

Tallow Toad. Candles for ritual purposes are often made of strange waxes mixed with rare oils and herbs.

Once a ritual is complete, unless ground up or melted down, these candles can transform into toad-like lumps of wax that wield tongues of flame and have an unquenchable desire to burn.

Chalk Chatterling. Chalk pentagrams and runes must be scrubbed after use, for even faint traces can birth a chalk chatterling, a tiny whirlwind of colored chalk dust that incessantly squeals the sounds its original markings were meant to signify.

Inkfester. Woe to any wizard who fails to pay attention to the expiration of their magical inks. If left untreated, old ink coalesces into bizarre two-dimensional creatures that masquerade as graffiti and psychically hurt victims through disturbing glyphs and imagery. These creatures can detach from walls, transforming into clouds of liquid ink to dissolve and drown unwary victims.

  • DC 10 Intelligence (Arcana): Arcane anomalies are constructs immune to poison and being charmed.
  • DC 15 Intelligence (Arcana): The tallow toad can spit hot wax that must be removed, or it continues to blister skin. Coming too close to a chalk chatterling can make spellcasting difficult. An inkfester can psychically assault the mind in one form or, in another, surround and consume victims. All these anomalies explode when destroyed.
  • DC 20 Intelligence (Arcana): Immersing any arcane anomaly in water hurts it. Wizards frequently scrub their laboratories clean to prevent these beings from emerging.
Section 15: Copyright Notice

Grim Hollow: The Monster Grimoire © 2021, Ghostfire Gaming Pty Ltd. Author: Shawn Merwin

This is not the complete section 15 entry - see the full license for this page