Aranea - Dungeons on Automatic Bestiary

Magical Beast (Shapechanger) · SM +0 Aranea [Monster Manual, page 15]

Attributes

ST10

DX11

IQ11

HT11

HP10

Will11

Per11

FP11

Basic Speed6

Basic Move7

Dodge9

DR1

Melee attacks

Usage	Level	Damage	Reach
Poisonous BitePoisonous Bite (11): thrust 1d-3 cutting + follow-up 1d-1 toxic (3 1-hour cycles, HT-3 to resist, Symptoms -3 ST at 2/3 HP), Reach C.	11	thrust 1d-3 cutting + follow-up 1d-1 toxic (3 1-hour cycles, HT-3 to resist, Symptoms -3 ST at 2/3 HP)	C
PunchPunch (11): thrust 1d-3 crushing, Reach C.	11	thrust 1d-3 crushing	C
WebWeb (11): Binding 10, Area of effect – 2 yards, stays for 10 seconds, range 10 yards, costs 2 FP.	11	Binding 10, Area of effect – 2 yards, stays for 10 seconds, range 10 yards, costs 2 FP	—
Alter PerceptionAlter Perception (11): An aranea can concentrate and make a Quick Contest of IQ versus Will (at -1 per person already affected) to override visual perception of a victim, if it can touch or see the victim. Apply normal range penalties. If tha aranea wins, it can alter the mental visual feed of the victim in any way it wishes, but it does not control the victim’s thoughts. This ability requires constant concentration. The victim still may choose to act on what he believes were his last correct sensory impressions (at -10 to any actions if he can’t see the real world). Usually, the aranes uses this ability to lure the victim into its web.	11	An aranea can concentrate and make a Quick Contest of IQ versus Will (at -1 per person already affected) to override visual perception of a victim, if it can touch or see the victim. Apply normal range penalties. If tha aranea wins, it can alter the mental visual feed of the victim in any way it wishes, but it does not control the victim’s thoughts. This ability requires constant concentration. The victim still may choose to act on what he believes were his last correct sensory impressions (at -10 to any actions if he can’t see the real world). Usually, the aranes uses this ability to lure the victim into its web	—

Traits (13)

Brain is in the hump on the back (requires a Physiology or other appropriate skill roll to target, but lacks DR 2)
Climbing Line
Clinging
Cold-Blooded (50°)
Extra Legs (Eight Legs)
Hideous
Infravision
Peripheral Vision
Phobia (Fire) (12)
Restricted Diet (Carnivore)
Short Arms
Social Stigma (Monster)
Subsonic Hearing (Biological (Passive); Melee Attack, Reach C)

Skills (1)

11Innate Attack (Projectile)

Notes

GCS ancestry draft: gcs/aranea.gct
Source template total: 182 points.
Library-rebuilt template total: 182 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.
GCS template includes a +6-point reconciliation child requiring decomposition.
Weight 150 lbs.

Encounter rating

CER14

Offense9

Protection5

Threat tierminor

Appearing6

Wandering4

GCS v5 downloads

Where this one came from

Source record: Aranea [Monster Manual, page 15]
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/aranea.gct
Source template total: 182 points.
Library-rebuilt template total: 182 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 2 annotated with the source's stated cost. 2 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.
GCS ancestry reconciliation adjudicated: the published template total is 182 points and the parsed source children sum to 176, a difference of +6. Classified as small arithmetic residual — a small residual consistent with rounding and per-level arithmetic in the published total; the rebuilt template keeps the author's total and carries the difference as an explicit reconciliation child. The authorized source total is preserved; the remaining manual step is opening gcs/aranea.gct in GCS to replace the reconciliation child with native constructions where the grouped ability can be decomposed.
CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 9, PR 5, CER 14, threat tier minor.
Conversion baseline reported OR 5, PR 5, CER 10 (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-b2-gcs-reconciliation); GCS fidelity check passed, DOA playability check passed.
The source-total difference is classified and documented in conversionNotes; the authorized published total is preserved and the residual stays visible as a reconciliation child.
Visual GCS verification of the .gct is not claimed by this decision; checks.gcsVisualPass is false.

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.