Animal · SM +0 Bat Swarm [Monster Manual, page 237]
Attributes
ST4
DX12
IQ3
HT12
HP8
Will10
Per12
FP10
Basic Speed6
Basic Move2
Dodge9
DR0
Melee attacks
| Usage | Level | Damage | Reach |
|---|---|---|---|
| Swarm BiteNo attack roll and no active defense. The swarm steps into close combat; the target automatically takes 1d cutting as large-area injury, reduced by DR normally. The only escape is to retreat or dodge-and-drop at least one yard away before the swarm acts. | no roll | 1d cutting | C |
Traits (7)
- Foot Manipulators
- Fur
- Night Vision 9
- No Fine Manipulators
- Short Lifespan 1
- Sonar (Accessibility, Not in water)
- Wild Animal
Skills (4)
- 13Aerobatics
- 13Flight
- 13Survival (Plains)
- 13Stealth
Notes
- GCS ancestry draft: gcs/bat-swarm.gct
- Source template total: 17 points.
- Library-rebuilt template total: 17 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.
- Swarm: the swarm is dispersed at 0 HP and destroyed at -HP. It cannot be slammed or grappled, is immune to crippling injuries, and takes reduced damage from most physical blows (Diffuse, flying swarm).
Encounter rating
CER18
Offense16
Protection2
Threat tierminor
Appearing1
Wandering4
Tags
- srd-3-5
- animal
GCS v5 downloads
Where this one came from
- Source record
- Bat Swarm [Monster Manual, page 237]
- 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/bat-swarm.gct
- Source template total: 17 points.
- Library-rebuilt template total: 17 points.
- CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
- Issue #5: the automatic swarm bite was added from the source's Cosmic (no die roll required, no active defense allowed) construction. Rated as an auto-hit attack, which raises the offense rating over the empty-attack baseline.
- CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 16, PR 2, CER 18, threat tier minor.
- Conversion baseline reported OR -4, PR 2, CER 1 (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 (solitary): average number appearing 1, 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.