Monstrous Centipede (Gargantuan)

Vermin · SM +3 Monstrous Centipede (Gargantuan) (Enraged Eggplant; answers SRD 3.5)

An immense dark-violet crawler under tarnished-brass shields, filling a corridor end to end and flowing along it faster than a man can run. It is blind, tracks warmth alone, and the black serrated mandibles set in its fortified head plate close on a body the way a portcullis closes on a doorway.

Attributes

ST32

DX10

IQ1

HT13

HP32

Will8

Per8

FP13

Basic Speed5.25

Basic Move5

Dodge8

DR5

Melee attacks

Usage	Level	Damage	Reach
MandiblesMandibles (13): thrust 4d-1 cutting plus follow-up 1d toxic (5 1-hour cycles, resisted by HT-3, -4 DX after loss of 2/3 HP), Reach C.	13	thrust 4d-1 cutting plus follow-up 1d toxic (5 1-hour cycles, resisted by HT-3, -4 DX after loss of 2/3 HP)	C

Traits (17)

• Acute Thermal Infrared Vision 4
• Blindness
• Clinging
• Cold-Blooded (50°)
• Double-Jointed
• High Pain Threshold
• Horizontal
• Infravision
• Injury Tolerance (No Brain, No Eyes, No Neck, No Vitals)
• No Legs (Slithers)
• No Manipulators
• Reduced Consumption 3 (Cast Iron Stomach)
• Restricted Diet (Carnivore)
• Short Lifespan 3
• Slippery 3
• Thermal Infrared Vision (Biological (Passive); Short-Range 1)
• Wild Animal with Mute

Skills (3)

• 13Brawling
• 12Stealth
• 12Tracking

Notes

• GCS ancestry draft: gcs/monstrous-centipede-gargantuan.gct
• Source template total: -85 points.
• Library-rebuilt template total: -85 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.
• Poison (follow-up on Bite): Toxic Attack 1d (Cyclic, 1 hour, 5 cycles, Resistible, +50%; Follow-Up, Bite, +0%; Resistible, HT-3, -15%; Symptoms, 2/3 HP, -4 DX, +40%) Resolve as stated by the construction; the source gives no separate resolution text.

Encounter rating

CER55

Offense25

Protection30

Threat tierstandard

Appearing2

Wandering3

Tags

• srd-3-5
• vermin

GCS v5 downloads

• ↓ Character sheet (.gcs)Open directly in GCS
• ↓ Ancestry template (.gct)Apply to any character

Where this one came from

Source record

Monstrous Centipede (Gargantuan)

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.

Description

Written by Dungeons on Automatic, released under cc_by_4_0

• GCS ancestry draft: gcs/monstrous-centipede-gargantuan.gct
• Source template total: -85 points.
• Library-rebuilt template total: -85 points.
• CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
• Issue #5: 2 special ability construction(s) restored (Poison). No disabling construction on this record carries a cost the affliction term can score.
• CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 25, PR 30, CER 55, threat tier standard.
• Conversion baseline reported OR 25, PR 28, CER 53 (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 (gregarious): 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.
• Description text is original Dungeons on Automatic prose written from this record's own converted statistics and from the project's art direction for the creature. It is not derived from the authorized fan-conversion source, which states no creature descriptions, and not from any SRD. It carries its own authorship and CC BY 4.0 terms in the description field. See review/policy/description-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.