Starfinder: Swimmer Arachnid

Chris Van Deelen

Swimmer Arachnid Combatant CR 3 XP 800

Neutral Medium Vermin

Init +3; Senses: Darkvision 60 ft.; Perception +8


Defense                                                             HP 40

EAC: 14 (17); KAC: 16 (19)

Fort: +7 (+17); Ref: +5; Will: +2

Defensive Abilities: DR 3 / -, hardened survivor; Immunities: Poison, radiation



Speed: 30 ft. Swim 60 ft.

Melee: Bite +11 (1d4+6 P) or two claws +7 (1d6+6 S)

Ranged: attack + (damage  type)

Space: 5 ft., Reach: 5 ft.

Offensive Abilities: Blood frenzy, poison bite.



Str +3; Dex +3; Con +1; Int -; Wis +0; Cha +0

Skills: Athletics +13 (+23), stealth +8

Feats: Cleave

Other Abilities: Waterborne

Languages: None



Environment: Any, but mainly any aquatic

Organization: Small pods (1d4+1), medium pods (2d4+2), large Pods (4d4+4), swarms (12d4+12)


Special Abilities

Blood Frenzy (Ex): Like many marine predators, the scent of blood in the water will cause the Swimmer to go into frenzy. This requires the creature to inflict actual hit-point damage on the target, and they must be within 20 feet of the bleeding target. The creature will gain a +2 to hit and +3 to damage, and will prefer to use the bite attack over all others. While it is in frenzy, it will suffer a -2 to both EAC and KAC. They will even attack one another if no enemy targets are available. This lasts for 2d4 rounds.

Hardened Survivor (Ex): The Swimmer arachnid is completely immune to poisons and radiation, and it is able to withstand extreme conditions, even utter vacuum. Whenever the beast must make a saving Fortitude saving throw when dealing with environmental conditions, it gains a +10.

Poison Bite (Ex): The bite of the Swimmer injects a paralytic poison. This poison uses the dexterity poison track (Core book, Pg. 415) Two Fort saves (DC 12) are required, and the victim can only be immobilized, they can’t die – although they can certainly drown!

Waterborne (Ex): The creature is fully capable of using a charge attack underwater and the creature likewise gains a +10 to Athletics (Swim) checks, and its EAC and KAC are increased by 3 as well.


Designed by the Arachnid Empire for water planets, or planets with abundant water, these creatures are their front-line troops in these environments. After all, the warriors are not the best swimmers! The creatures have a vague resemblance to Water Beetles, but are significantly larger, although they are smaller than the warrior arachnids.

The creatures move with amazing speed and grace in the water, and can use it to hide their presence from their targets. They are also equipped with a nasty paralytic poison, which they will use to incapacitate enemy combatants, often leading to the enemy drowning!

If the creatures have a single flaw, it is that they tend to go into a feeding frenzy when they detect blood in the water. This does not extend to land combat, only when they are in the water.

They tend to swarm the way the warrior Arachnids do, and are rarely found alone. They are utterly fearless, and due to their physical design, are perfectly capable of moving on land, but not as quickly or as dextrous.

Starfinder Creature Index

Chris Van Deelen is the creator and contributor to over half of the Wisdom from the Wastelands series, contributor to the Swords of Kos: Hekaton anthology, and the recently released 'Swords of Kos: The Rite'. He also wrote Creatures of the Tropical Wastelands, and 100 Oddities found in a Car. As prolific as he is, Chris Van Deelen continues to write and produce material which will be in publication soon. Not only is he a prolific content creator, he also has a wide selection of fiction and stories! If you like his work, please follow his personal author page on Facebook and on Twitter to keep up with his latest news and game content.