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Astomoi appear to be made of pure darkness. They require no food—indeed, they have no mouths—and they have no eyes with which to survey their environment. Instead, they rely on their powerful minds to sense the world around them and subsist on nutrients absorbed from the air. This can turn against them, however, as powerful smells and inhaled poisons can render an astomoi helpless. Predisposed to asceticism, astomoi rarely wear more than rags, if they wear anything at all.

Astomoi are found throughout the galaxy, usually on worlds that get very little light. Their sudden appearance in already populated regions of space suggest an extra planar origin, though all magical and mundane tests show they are not outsiders. Researchers are still attempting to ascertain the origin of the astomoi, but members of that species aren’t saying anything conclusive as to their homeworld or their purpose.

Racial Traits

Ability Adjustments: +2 Int, +2 Wis, -2 Con

Hit Points: 2

Size and Type: Astomoi are Medium humanoids with the astomoi subtype.

Mouthless (Ex)

Astomoi don’t need to eat or drink to survive. Instead, they absorb the essence of food and drink; this consumes the nutrients of the meal as though it had been eaten, rendering the food useless to others. Astomoi consume serums and other ingested materials in the same fashion. Since they never actually ingest anything, they can’t normally be exposed to ingested poisons.

Sensitive Breath (Ex)

Astomoi take a –2 penalty on saving throws against disease and inhaled poisons.

Telepathic Senses (Ex)

Astomoi can’t speak or see, granting them the sightless quality. They compensate by mentally sensing the area within 60 feet, granting them blindsight (thought). An astomoi can use language-dependent abilities with its telepathy, but not abilities that depend on audible components.

Limited Telepathy: Astomoi can mentally communicate with any creature within 30 feet with whom they share a language. Conversing telepathically with multiple creatures simultaneously is just as difficult as listening to multiple people speaking.


This subtype is applied to astomoi and creatures related to astomoi.

Traits: Blindsight (thought) 60 ft., blindsense (scent) 60 ft., sightless; if the NPC is of the astomoi race, it also gains the limited telepathy racial trait, mouthless trait, and sensitive breath trait.

Section 15: Copyright Notice

Alien Codex (Starfinder) © 2019, Legendary Games; Lead Designer: Jason Nelson. Authors: Anthony Adam, Kate Baker, John Bennet, Eytan Bernstein, Robert Brookes, Russ Brown, Duan Byrd, Paris Crenshaw, Jeff Dahl, Robyn Fields, Joel Flank, Matt Goodall, Robert J. Grady, Jim Groves, Steven T. Helt, Thurston Hillman, Tim Hitchcock, Nick Hite, Daniel Hunt, Mike Kimmel Marshall, Isabelle Lee, Jeff Lee, Lyz Liddell, Jason Nelson, Richard Pett, Tom Phillips, Jeff Provine, Alistair J. Rigg, Alex Riggs, Wendall Roy, Mike Shel, Neil Spicer, Todd Stewart, Russ Taylor, Rachel Ventura, Mike Welham, George Loki Williams, Scott Young.