Spoiler noticeMajor spoilers ahead

The Monster Manual reveals creatures, bosses, abilities and where you’ll encounter them, including content still in development. Even if you’re testing the game, we recommend playing through the first four adventures once before reading further. Keep the surprises intact until you’re ready to explore the full bestiary.

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Major spoilers ahead

The Monster Manual reveals creatures, bosses, abilities and where you’ll encounter them, including content still in development. Even if you’re testing the game, we recommend playing through the first four adventures once before reading further. Keep the surprises intact until you’re ready to explore the full bestiary.

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Volume III · Monster ManualBuild 25

The Gatekeeper

Creatures of the Crooked Mile

A complete creature referenceOpen the book ↓
The Gatekeeper
Implemented development through Build 25Reviewed 28 October 2026

Chain-bound guardian · Physical

Some doors are guarded by locks. This one has a more personal arrangement.

Reference statistics

Basic difficulty · ordinary profile before temporary states and encounter adjustments

HP
96
Armor class
15
Attack
+6
Damage
d6+2
Initiative
6
Strikes
2

Weaknesses Wind

Resistances Earth

Polymorph immunity Yes

Traits and special behavior

Two strikes, avoids previous random target. Gate Block halves first positive direct hit each round, ceiling rounded; Poison/retaliation/self-injury do not consume it. Immune to Polymorph.

See the condition reference for the shared effects, and enemy tuning for difficulty-wide chance adjustments.

Statistics by difficulty

DifficultyHPACAttackDamageStrikes
Basic9615+6d6+22
Advanced19420+9d6+42
Expert23826+12d6+62
Master29328+14d6+82
Master+36030+15d6+112

Includes explicit tier overrides and the final maximum-HP multiplier. Damage is the ordinary die and bonus, before final outgoing multipliers. Rage, growth, buffs, encounter adjustments and special action damage are not baked into this table.

Current appearances

AdventureLocationEncounter roster
The Lost DungeonsThe Sunken GateThe Gatekeeper × 1

Detailed reference

These panels retain the exact authored configuration, including unscaled base values. For tier overrides, −1 Attack or damage bonus and zero HP or strikes mean “inherit”; tier indices run from 0 (Basic) to 4 (Master+). Field values and message templates are shown as reference data, not additional rules.

Creature configuration
Stable identifier
gatekeeper
Name
The Gatekeeper
Plate Name
Keeper
Role
Chain-bound guardian
HP
88
Armor class
15
Attack
5
Damage die
6
Damage bonus
1
Initiative
6
Artwork registry index
26
Visual Scale
1.48
Preserve Aspect
Yes
Element
Attack Text
{actor} lashes out at {target}.
Round Block
Yes
Distinct Targets
Yes
Strikes per action
2
Immune to Polymorph
Yes
Weaknesses
  1. Wind
Resistances
  1. Earth
Visual Top Padding
0.058867
Visual Bottom Padding
0.032787
Tier Damage Multiplier
0.75
Tier Adjustments
  1. Tier index (0–4)
    2
    HP
    72
    Damage bonus
    0
  2. Tier index (0–4)
    3
    HP
    65
    Damage bonus
    0
  3. Tier index (0–4)
    4
    HP
    60
    Damage bonus
    0
  4. Tier index (0–4)
    0
    Attack
    6
    Damage bonus
    2
    HP
    96
Attack Sound
combat.chainSwing
Encounter configurations (1)

Whole encounter rewards and modifiers are shown here; they are not rewards for defeating this creature alone. Legacy fields remain visible for configuration audits.

  1. Stable identifier
    sunkenGatekeeper
    Enemies
    1. gatekeeper
    Gold
    36
    Xp
    42
    Opening
    The Gatekeeper halves its first hit each round. Its chain strikes two heroes.
Artwork and presentation
Resource
JournalArt/Adventures/LostDungeons/Creatures/Gatekeeper
Registrations
  1. Resource
    JournalArt/Adventures/LostDungeons/Creatures/Gatekeeper
    Height Units
    1.9
    Body Height
    0.908346
    Ground Y
    0.032787
    Center X
    0.502133

Download the exact creature definition (JSON)

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