Frost Worm - Dungeons on Automatic Bestiary

Magical Beast (Cold) · SM +5 Frost Worm [Monster Manual, page 111]

Attributes

ST45

DX9

IQ2

HT15

HP45

Will10

Per10

FP30

Basic Speed6

Basic Move6

Dodge9

DR4

Melee attacks

Usage	Level	Damage	Reach
FangsFangs (11): thrust 6d impaling (KYOS: 7d impaling), Reach C.	11	thrust 6d impaling (KYOS: 7d impaling)	C
Breathe FrostBreathe Frost (11): The worm breathes out a blast of extremely cold vapor, dealing thrust 4d-1 non-incendiary burning damage (KYOS: 4d) as large-area injury. Targets injured by this attack must make an HT roll, at -1 per 2 points of injury, or take a -2 penalty to DX and become Numb (p. B146) for (20-HT) minutes (minimum 1 minute). This is a cone attack that uses rules from Area and Spreading Attacks (pp. B413-414). The cone is 1-yard wide and has a length of 9 yards (ST/5). Each use costs 2 FP. It is possible to make the cone wider by using the rules from Cones of Power (GURPS Dungeon Fantasy Monsters 4: Dragons, p. 10). It will blow out any ordinary fire (candle, lantern, torch, etc.).	11	The worm breathes out a blast of extremely cold vapor, dealing thrust 4d-1 non-incendiary burning damage (KYOS: 4d) as large-area injury. Targets injured by this attack must make an HT roll, at -1 per 2 points of injury, or take a -2 penalty to DX and become Numb (p. B146) for (20-HT) minutes (minimum 1 minute). This is a cone attack that uses rules from Area and Spreading Attacks (pp. B413-414). The cone is 1-yard wide and has a length of 9 yards (ST/5). Each use costs 2 FP. It is possible to make the cone wider by using the rules from Cones of Power (GURPS Dungeon Fantasy Monsters 4: Dragons, p. 10). It will blow out any ordinary fire (candle, lantern, torch, etc.)	—
Death ThroesWhen killed, a frost worm turns to ice and shatters in an explosion that deals 6d non-incendiary burning explosive damage and releases [1d] impaling fragments that can damage anyone within 5 yards. Targets injured by this attack must make an HT roll, at -1 per 2 points of injury, or take a -2 penalty to DX and become Numb (p. B146) for (20-HT) minutes (minimum 1 minute).	—	6d burning	—
TrillA frost worm can emit a noise that forces its prey to stand motionless. This effect affects all creatures other than frost worms within a 32-yard radius. Creatures must succeed on a Will roll or be dazed (p. B428) for 3 seconds times margin of failure. After that each subject is stunned (p. B420) and may roll vs. Will once per second to recover. Victims must be able to hear the trill to be affected. Using the trill costs 1 FP.	—	—	32 yards

Traits (16)

Blindness
Chameleon 3 (Dynamic; Environmental, Snow)
Early Maturation 2
Immunity to Frost Worm Trill
Immunity to Noxious Cold Effects
Injury Tolerance (No Eyes, No Head, No Neck)
No Legs (Slithers)
No Manipulators
Phobia (Fire) (12)
Pressure Support 1
Reduced Consumption 3
Restricted Diet (Carnivore)
Sonar (Accessibility, In air; Biological (Passive); Restricted Arc, 60°; Targeting)
Temperature Tolerance 5 (Cold)
Vulnerability (Fire, x2)
Wild Animal

Skills (2)

11Brawling
11Innate Attack (Breath)

Notes

GCS ancestry draft: gcs/frost-worm.gct
Source template total: 170 points.
Library-rebuilt template total: 170 points.
CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
Review attacks, special abilities, encounter frequency, treasure, grappling, and GCS modifiers before approval.

Encounter rating

CER120

Offense74

Protection46

Threat tiersevere

Appearing1

Wandering1

GCS v5 downloads

Where this one came from

Source record: Frost Worm [Monster Manual, page 111]
Source system: gurps_4e_fan_conversion / author_permission
Released under: cc_by_4_0
Conversion: 0.2.0-reviewed
Review status: approved
Credit: Original GURPS conversion by Enraged Eggplant, from Monsters (May 11, 2024); adapted and republished with permission.

GCS ancestry draft: gcs/frost-worm.gct
Source template total: 170 points.
Library-rebuilt template total: 170 points.
CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
Issue #5: 2 special ability construction(s) restored (Death Throes, Trill). 1 save-or-disable construction(s) are scored through the affliction term at the source's stated point cost, or at Binding ST where the source builds the ability as a Binding.
CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 74, PR 46, CER 120, threat tier severe.
Conversion baseline reported OR 63, PR 46, CER 109 (tier severe). The reviewed values come from the consumer CER implementation, which rounds damage once after the damage-type multiplier and credits ranged accuracy; the conversion baseline ceilinged the damage base first and ignored range.
Encounter metadata derived (solitary): average number appearing 1, wandering weight 1. Encounter metadata derived for 0.2.0 from the reviewed threat tier and creature class (appearing: minor 4 / standard 2 / major 1 / severe 1, forced to 1 for solitary classes — including swarms, which are a single multi-body creature — and raised to 6 for gregarious minor creatures; wandering weight: minor 4 / standard 3 / major 2 / severe 1). The fan-conversion source states no appearing-in-numbers or wandering values, so these are derived, not source mechanics.
Lair, treasure, and grappling remain unpopulated in 0.2.0 by package policy: the authorized fan-conversion source states no lair, treasure, or grappling values, and review declines to invent them. See review/policy/0.2.0-empty-field-policy.md.
Review approved by automated-mechanical-review on 2026-07-26 (batch ee-2026-07-26-b3-cer-tails); GCS fidelity check passed, DOA playability check passed.
CER tail record. The rating was recomputed through the consumer CER path and the tail was read against package peers in review/reports/cer-audit.md; a floor of 1 reflects a genuinely feeble creature and a severe rating tracks the record's own HP, DR and damage.

Enraged Eggplant GURPS monster conversions; used, adapted, and republished with unrestricted permission from the author. Portrait and tokens are AI-generated original art. Sources and credits.