Medusa - Dungeons on Automatic Bestiary

Monstrous Humanoid · SM +0 Medusa [Monster Manual, page 180]

Attributes

ST10

DX12

IQ11

HT11

HP10

Will11

Per11

FP11

Basic Speed5.75

Basic Move5

Dodge8

DR—

Melee attacks

Usage	Level	Damage	Reach
PunchPunch (12): thrust 1d-3 crushing, Reach C.	12	thrust 1d-3 crushing	C
Short BowShort Bow (13): thrust 1d-2 impaling, Acc 1, Range 150/200, RoF 1, Shots 1(2).	13	thrust 1d-2 impaling, Acc 1, Range 150/200, RoF 1, Shots 1(2)	—
Snake HairSnake Hair (12): thrust 1d-1 piercing plus follow-up poison 1d-2 toxic (3 1-hour cycles, resisted by HT-1, -3 ST after loss of 1/3 HP). Reach C.	12	thrust 1d-1 piercing plus follow-up poison 1d-2 toxic (3 1-hour cycles, resisted by HT-1, -3 ST after loss of 1/3 HP)	C
Petrifying GazePetrifying Gaze (14): A medusa’s petrifying gaze spreads out in a cone 15 yards long and 15 yards wide at the end. She cannot select who is affected; all potential victims must be looking at her, including insubstantial beings. Roll a Quick Contest of the medusa’s Will versus the target’s HT, using normal range penalties. If the medusa wins, the target is petrified. This effect cannot be dispelled by Dispel Magic – a more powerful effect, such as Stone to Flesh or Remove Curse, is required. Someone looking at a reflection of a medusa is not affected by her gaze, but the medusa itself can petrify itself by looking at its own reflection. Fighting while looking in a mirror is at a -5 penalty; attacks made with closed eyes are at -10.	14	A medusa’s petrifying gaze spreads out in a cone 15 yards long and 15 yards wide at the end. She cannot select who is affected; all potential victims must be looking at her, including insubstantial beings. Roll a Quick Contest of the medusa’s Will versus the target’s HT, using normal range penalties. If the medusa wins, the target is petrified. This effect cannot be dispelled by Dispel Magic – a more powerful effect, such as Stone to Flesh or Remove Curse, is required. Someone looking at a reflection of a medusa is not affected by her gaze, but the medusa itself can petrify itself by looking at its own reflection. Fighting while looking in a mirror is at a -5 penalty; attacks made with closed eyes are at -10	—

Traits (5)

Callous
Immunity to Petrifying Gaze of Other Medusae
Infravision
Scales
Social Stigma (Monster)

Skills (2)

13Bow
14Innate Attack (Gaze)

Notes

GCS ancestry draft: gcs/medusa.gct
Source template total: 101 points.
Library-rebuilt template total: 101 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

CER23

Offense21

Protection2

Threat tierminor

Appearing6

Wandering4

GCS v5 downloads

Where this one came from

Source record: Medusa [Monster Manual, page 180]
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/medusa.gct
Source template total: 101 points.
Library-rebuilt template total: 101 points.
CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
Issue #5: 0 special ability construction(s) restored and 1 annotated with the source's stated cost. 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 21, PR 2, CER 23, threat tier minor.
Conversion baseline reported OR 7, PR 2, CER 9 (tier minor). 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 (gregarious): average number appearing 6, wandering weight 4. 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.