The Eurypterids

[Andrew D. Gable]

...a conglomerate of horseshoe crab, scorpion, and lobster. Their flattened and segmented bodies are covered with chitin... Each animal has two highly developed eyes... There are six pairs of appendages... The abdomen consists of twelve overlapping plates tapering to a spike... They are carnivorous, eating whatever marine life they can catch.

~ From "The Scuttling", found in Sacraments of Evil

Larval Eurypterid
Tiny Vermin

Hit Dice: ½d8-2 (1 hp)
Initiative: +2 (+2 Dex)
Speed: 20 ft., 40 ft. swim
Armor Class: 14 (+2 size, +2 Dex)
Attacks: 2 pincers +1 melee; or bite -1 melee
Damage: Pincer 1, bite 1 plus poison
Face/Reach: 2½ ft. by 2½ ft./0 ft.
Special Attacks: Poison
Special Qualities: Damage reduction 2, vermin traits
Saves: Fort -3, Ref +2, Will -2
Abilities: Str 5, Dex 14, Con 5, Int —, Wis 7, Cha 2
Skills: Hide +6, Move Silently +6
Sanity Loss: 0/1d3

Paralysis (Ex): Those stung by a larval eurypterid's tail must make a Fortitude save, DC 7, or be paralyzed for 1 hour. The save DC is Constitution-based.


Mature Eurypterid
Small Vermin

Hit Dice: 2d8 (9 hp)
Initiative: +2 (+2 Dex)
Speed: 30 ft., 60 ft. swim
Armor Class: 13 (+1 size, +2 Dex)
Attacks: 2 pincers +0 melee; or bite +0 melee
Damage: Pincer 1d3-1, bite 1d4-1 plus poison
Face/Reach: 5 ft. by 5 ft./5 ft.
Special Attacks: Poison
Special Qualities: Damage reduction 4, vermin traits
Saves: Fort +0, Ref +2, Will -2
Abilities: Str 8, Dex 14, Con 11, Int —, Wis 7, Cha 2
Skills: Hide +7, Move Silently +7
Sanity Loss: 0/1d4

Paralysis (Ex): Those stung by a mature eurypterid's tail must make a Fortitude save, DC 11, or be paralyzed for 1d2 hours. The save DC is Constitution-based.


Mother Eurypterid
Large Vermin

Hit Dice: 4d8+12 (30 hp)
Initiative: +0
Speed: 40 ft., 60 ft. swim
Armor Class: 9 (-1 size)
Attacks: 2 pincers +2 melee; or bite +2 melee
Damage: Pincer 1d6+3, bite 1d8+3 plus poison
Face/Reach: 5 ft. by 10 ft./5 ft.
Special Attacks: Poison
Special Qualities: Damage reduction 7, vermin traits
Saves: Fort +3, Ref +0, Will +0
Abilities: Str 16, Dex 11, Con 17, Int —, Wis 11, Cha 2
Skills: Hide +3, Move Silently +9
Sanity Loss: 0/1d8

Paralysis (Ex): Those stung by a mother eurypterid's tail must make a Fortitude save, DC 15, or be paralyzed for 1d4 hours. The save DC is Constitution-based.

*****

These guys use a house rule in my COC, which is to give everything flat DR. It's more in line with how armor worked in Chaosium.

 

[demiurge1138]

I think you've got the San damage a little high for the "mother euryptarid". After all, a byakhee (described as "something I cannot and must not recall") only have 1/1d6. A similar number is used for equally horrifying things like animated corpses, deep ones and elder things. I don't think a really big swimming scorpion is more horrifying than zombies or barrel-starfish from another age.

Other than that, I like them, though.
Demiurge out.

 

[Andrew D. Gable]

The 0/1d8, while a bit high, is what's given them in the original Chaosium material. The conversion guidelines in the COC book said not to change this...but it does all sound a bit high.