Couatl - Dungeons on Automatic Bestiary

Outsider · SM +2 Couatl [Monster Manual, page 37, Expanded Psionic Handbook, page 193]

Attributes

ST24

DX12

IQ13

HT12

HP24

Will14

Per14

FP12

Basic Speed6

Basic Move4

Dodge9

DR4

Melee attacks

Usage	Level	Damage	Reach
FangsFangs (16): thrust 2d+2 impaling (KYOS: 5d-1 impaling) plus follow-up 1d-1 toxic (resisted by HT-3, 2 1-hour cycles, -3 ST after losing 1/3 HP, -4 ST after losing 2/3 HP), Reach C.	16	thrust 2d+2 impaling (KYOS: 5d-1 impaling) plus follow-up 1d-1 toxic (resisted by HT-3, 2 1-hour cycles, -3 ST after losing 1/3 HP, -4 ST after losing 2/3 HP)	C
Sun AweWith a Ready maneuver, the couatl in direct sunlight can spread its rainbow-colored wings to create awe-inspiring patterns. When a creature sees these patterns, it must roll a Fright Check at a -3 penalty using the Awe variant table (GURPS Powers, p. 85). If a victim succeeds at his Fright Check, he will be unaffected by this ability for one hour.	—	—	—

Traits (26)

Acute Taste and Smell 3
Amphibious
Born Biter 2
Cold-Blooded (50°)
Constriction Attack
Doesn’t Breathe (Oxygen Storage, 200x)
Double-Jointed
Early Maturation 4
ER 10 (Magic)
Extended Lifespan 5
Flight (Cannot Hover; Winged)
Infravision
Less Sleep 4
Nictitating Membrane 2
No Legs (Slithers)
No Manipulators
Peripheral Vision
Protected Vision
Reduced Consumption 4
Restricted Diet (Carnivore)
Scales
See Invisible (Magic; Magical; True Sight)
Temperature Tolerance 2 (Hot)
Terrain Adaptation (Slippery)
Terrain Adaptation (Uneven)
Truthfulness (6)

Skills (18)

13Aerobatics
15Area Knowledge (Local Area)
16Brawling
15Detect Lies
15Diplomacy
16Innate Attack (Breath)
15Observation
13Religious Ritual (Jazirian)
14Stealth
16Survival (Jungle)
14Swimming
13Thaumatology
14Theology (Jazirian)
16Wrestling
13Mind Clouding
14Mind Shield
14Psi Sense
13Telesend

Notes

GCS ancestry draft: gcs/couatl.gct
Source template total: 566 points.
Library-rebuilt template total: 566 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.
Nondetection: The couatl is nearly impossible to detect, see, or divine with any Information spells, regardless of the magic system used to cast them. Reduce the diviner’s effective margin of success by 10 for these purposes – so a spell that succeeded by 0-9 completely fails to find the couatl, while one that succeeded by 10+ provides less information than normal and is at a huge disadvantage if it’s resisted.
Poison (follow-up on Bite): Toxic Attack 1d-1 (Cyclic, 1 hour, 2 cycles, Resistible, +20%; Follow-Up, Bite, +0%; Resistible, HT-3, -15%; Symptoms, 1/3 HP, -3 ST, +45%; Symptoms, 2/3 HP, -4 ST, +20%) Resolve as stated by the construction; the source gives no separate resolution text.

Encounter rating

CER58

Offense32

Protection26

Threat tierstandard

Appearing2

Wandering3

GCS v5 downloads

Where this one came from

Source record: Couatl [Monster Manual, page 37, Expanded Psionic Handbook, page 193]
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/couatl.gct
Source template total: 566 points.
Library-rebuilt template total: 566 points.
CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
Issue #5: 4 special ability construction(s) restored (Sun Awe, Poison). 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 32, PR 26, CER 58, threat tier standard.
Conversion baseline reported OR 24, PR 26, CER 50 (tier standard). 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 (default): average number appearing 2, wandering weight 3. 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.