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Hydra

Magical Beast · major threat

Hydra bestiary portrait
Hydra top-down encounter tokenHydra top-down flat-top hex token

Magical Beast · 16 hexes · SM +3 Hydra [Monster Manual, page 155]

Attributes

ST35
DX11
IQ2
HT13
HP35
Will12
Per12
FP13
Basic Speed6
Basic Move6
Dodge10
DR3

Melee attacks

UsageLevelDamageReach
FangsFangs (13): thrust 4d+2 impaling (KYOS: 7d+2 impaling), Reach C-2.13thrust 4d+2 impaling (KYOS: 7d+2 impaling)C-2

Traits (12)

  • Amphibious
  • Combat Reflexes
  • Discriminatory Smell
  • Extra Attack 2
  • Extra Legs (Four Legs)
  • Horizontal
  • Infravision
  • Long Neck 3
  • Night Vision 5
  • No Fine Manipulators
  • Peripheral Vision
  • Wild Animal

Skills (3)

  • 13Brawling
  • 12Survival (Swampland)
  • 12Tracking

Notes

  • GCS ancestry draft: gcs/hydra.gct
  • Source template total: 508 points.
  • Library-rebuilt template total: 508 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

Tags

  • srd-3-5
  • srd-5-1
  • magical-beast

GCS v5 downloads

Where this one came from
Source record
Hydra [Monster Manual, page 155]
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/hydra.gct
  • Source template total: 508 points.
  • Library-rebuilt template total: 508 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.