Errata of the Ninth Margin

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Medium Monstrosity (shapechanger), Neutral Evil

Armor Class 15 (mapskin)

Hit Points 52 (8d8+16)

Speed 30 ft. climb 20 ft.

STR 12 (+1)

DEX 16 (+3)

CON 14 (+2)

INT 14 (+2)

WIS 13 (+1)

CHA 15 (+2)

Saving Throws Dex +5, Wis +3

Skills Stealth +5, Survival +4, Deception +4, Perception +3

Damage Resistances psychic

Condition Immunities prone

Senses darkvision 60 ft., passive Perception 13

Languages Common, one language known by its creator

Challenge 3 (700 XP) Proficiency Bonus +2

The Ink Makes Room. The Errata can move through nonmagical paper, parchment, canvas, and thin wooden surfaces as if they were difficult terrain. It leaves behind a black, damp-looking outline of its body. If it ends its turn inside such a surface, it is shunted to the nearest unoccupied space and takes 5 (1d10) force damage.

The List of Trespassers. The Errata carries a stitched ledger containing the names of creatures that have entered its territory. At the start of combat, it chooses one creature it can see as the current entry. The Errata has advantage on attack rolls against that creature until the end of its next turn. Whenever the chosen creature takes damage from the Errata, the Errata can choose a different creature it can see as the current entry.

Misleading Boundaries. The area within 10 feet of the Errata is subtly rearranged. This area is difficult terrain for its enemies, and the Errata can move through it without provoking opportunity attacks.

Actions

Multiattack. The Errata makes two Margin-Slash attacks.

Margin-Slash. Melee weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8+3) slashing damage, plus if the target is the current entry on the List of Trespassers 3 (1d6) psychic damage. The Errata's arm unfolds into a ruler-straight blade of black ink.

Pin the Location. Ranged weapon Attack: +5 to hit, range 60/120 ft., one target. Hit: 10 (2d6+3) piercing damage. The Errata hurls a brass map pin. If the target is Large or smaller, it must succeed on a DC 13 Strength saving throw or have its speed reduced to 0 until the end of its next turn.

Redraw the Road (Recharge 5-6). The Errata chooses a point it can see within 60 feet. A crooked line of ink appears on the ground between the Errata and that point, creating a 20-foot-long, 5-foot-wide hazard. Each creature in the line must make a DC 13 Dexterity saving throw, taking 10 (3d6) force damage on a failed save, or half as much on a successful one. On a failed save, a creature is also teleported to the nearest unoccupied space at either end of the line, chosen by the Errata.

Bonus Actions

Turn the Page. The Errata teleports up to 15 feet to an unoccupied space it can see adjacent to paper, parchment, canvas, or a map. Until the start of its next turn, the first attack made against it has disadvantage.

Reactions

Not on the Map. When a creature the Errata can see targets it with an attack, the Errata shifts 5 feet and imposes disadvantage on the attack roll. If the attack misses, the Errata can move up to 10 feet without provoking opportunity attacks.

Environment Forest, Hill, Urban

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"You were warned by the blank space." — Ilyra Venn, final note in the Ninth Margin survey book

Lore & Description

Appearance

The Errata of the Ninth Margin resembles a tall, narrow person cut from several mismatched maps. Its skin is yellowed vellum stretched over angular bones, its joints are bound with red thread, and rivers of wet black ink pulse beneath its surface. A compass rose has opened where its face should be, with a single needle swiveling toward the nearest trespasser. Its fingers end in brass map pins, and a leather ledger hangs from its ribs like a second, external heart.

Behavior & Origins

The Errata was born when the surveyor Ilyra Venn accidentally drew a valley that did not exist, then inked the name Bellweather Hollow beside it. The map was copied, sold, and followed by travelers until the error acquired shape, borders, and a furious sense of ownership. The creature now claims the abandoned survey station called Ninth Margin as its capital and records every visitor in its ledger. It especially hates anyone carrying a map that depicts the hollow incorrectly. The party is already written in the book beneath the heading: "Arrivals to be Corrected."

Running Errata of the Ninth Margin

Tactics

The Errata begins by using Pin the Location against the most mobile character, then closes on the creature listed in its ledger. It uses Misleading Boundaries and Turn the Page to fight around corners, maps, and narrow passages while Redraw the Road separates the party. When reduced below half its hit points, it abandons direct attacks and tries to flee toward Ninth Margin; if cornered there, it fights to destroy the party's maps and ledger before dying.

DM Tips

Telegraph the danger with road signs pointing in contradictory directions, footprints that end at blank parchment, and the party's names written in fresh ink on an old survey marker.
Give the Errata a precise, offended voice; it corrects pronunciations, distances, and claims of ownership during combat.
For a weaker party, remove the psychic damage from the List of Trespassers and reduce Redraw the Road to 2d6 force damage.
For a stronger party, let Misleading Boundaries extend 15 feet and allow the Errata to use Turn the Page once each round without spending a bonus action.

Loot

The Ninth Margin Ledger — A stitched list of every visitor to Bellweather Hollow, including several names belonging to people who have not yet arrived. A name can be crossed out with a successful DC 15 Intelligence (Arcana) check, ending the Errata's advantage against that creature.
Brass Surveyor's Compass — The compass points toward the nearest place omitted from the current map. Its needle becomes still near hidden roads, forgotten ruins, and magically concealed locations.
Error Map of Bellweather Hollow — A living map that changes when folded. Once per day, its bearer can ask it to reveal a safe route through a mapped wilderness, granting advantage on one group Wisdom (Survival) check.

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Generation Info

Original prompt:
"CR 3: A cartographer's error that became a real place, and resents visitors. It keeps a list, and the party is on it."

Created: Oct 10, 2026
Modified: Oct 26, 2026

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