Derro

Monstrous Humanoid · SM -2 Derro (Enraged Eggplant; answers SRD 3.5)

A compact, pale-violet humanoid barely four feet tall, with oversized eyes that cannot bear daylight. They move quietly, fight with a short blade and a light crossbow, and pursue elaborate cruelties for reasons that make complete sense to them and none to anyone else.

Attributes

ST5

DX11

IQ10

HT11

HP5

Will10

Per10

FP11

Basic Speed5.5

Basic Move4

Dodge9

DR2

Melee attacks

Usage	Level	Damage	Reach
SM-2 SmallswordSM-2 Smallsword (12): thrust 1d-3 impaling. Reach 1.	12	thrust 1d-3 impaling	1
SM-2 Crossbow (ST 5)SM-2 Crossbow (ST 5) (13): thrust 1d-2 impaling, Acc 4, Range 100/125, RoF 1, Shots 1(4). A derro usually carries 1d doses of Medium-size Spider Venom.	13	thrust 1d-2 impaling, Acc 4, Range 100/125, RoF 1, Shots 1(4). A derro usually carries 1d doses of Medium-size Spider Venom	—

Traits (7)

• Callous
• Combat Reflexes
• Infravision
• Magic Resistance 1 (Improved)
• Sadism (12)
• Silence 1
• Weakness (1d per 30 minutes; Sunlight)

Skills (7)

• 13Crossbow
• 12Innate Attack (Gaze)
• 12Interrogation
• 12Intimidation
• 12Poisons/TL3
• 12Smallsword
• 14Stealth

Notes

• GCS ancestry draft: gcs/derro.gct
• Source template total: 6 points.
• Library-rebuilt template total: 6 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.

Encounter rating

CER6

Offense5

Protection1

Threat tierminor

Appearing6

Wandering4

Tags

• srd-3-5
• monstrous-humanoid

GCS v5 downloads

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

Where this one came from

Source record

Derro

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/derro.gct
• Source template total: 6 points.
• Library-rebuilt template total: 6 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 5, PR 1, CER 6, threat tier minor.
• Conversion baseline reported OR 6, PR 1, CER 7 (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.
• 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.