Cryohydra - Dungeons on Automatic Bestiary

Magical Beast (Cold) · 16 hexes · SM +3 Cryohydra [Monster Manual, page 157]

Attributes

ST35

DX11

IQ2

HT13

HP35

Will12

Per12

FP13

Basic Speed6

Basic Move6

Dodge10

DR3

Melee attacks

Usage	Level	Damage	Reach
FangsFangs (13): thrust 4d+2 impaling (KYOS: 7d+2 impaling), Reach C-2.	13	thrust 4d+2 impaling (KYOS: 7d+2 impaling)	C-2
Breathe ColdBreathe Cold (13): The hydra breathes out a blast of extremely cold vapor, dealing thrust 3d-1 non-incendiary burning damage (KYOS: 4d-1) 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 7 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.).	13	The hydra breathes out a blast of extremely cold vapor, dealing thrust 3d-1 non-incendiary burning damage (KYOS: 4d-1) 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 7 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.)	—

Traits (14)

Amphibious
Combat Reflexes
Discriminatory Smell
Extra Attack 2
Extra Legs (Four Legs)
Horizontal
Immunity to Noxious Fire Effects
Infravision
Long Neck 3
Night Vision 5
No Fine Manipulators
Peripheral Vision
Temperature Tolerance 3 (Cold)
Wild Animal

Skills (4)

13Brawling
13Innate Attack (Breath)
12Survival (Swampland)
12Tracking

Notes

GCS ancestry draft: gcs/cryohydra.gct
Source template total: 646 points.
Library-rebuilt template total: 646 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.
Size 16 hexes; Weight 4,000 lbs.

Encounter rating

CER76

Offense38

Protection38

Threat tiermajor

Appearing1

Wandering2

GCS v5 downloads

Where this one came from

Source record: Cryohydra [Monster Manual, page 157]
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/cryohydra.gct
Source template total: 646 points.
Library-rebuilt template total: 646 points.
CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 38, PR 38, CER 76, threat tier major.
Encounter metadata derived (solitary): average number appearing 1, wandering weight 2. 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-b4-special-mechanics); GCS fidelity check passed, DOA playability check passed.
Special-mechanics record. Mechanics the CER path cannot price are named per record in review/reports/cer-audit.md rather than folded into the number, and encounter counts are capped where a save-or-disable attack is present.

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.