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Alchemical Ooze Swarm

Alchemical Ooze Swarm CR 1

Dozens of tiny globs of slime move on their own, acting as one being, alternately clinging to each other and separating in a riot of oozing momentum.

XP 400
N Tiny ooze (swarm)
Init +0; Senses blindsight (thermal) 60 ft.; Perception +5


EAC 11; KAC 13
Fort +5, Ref +1, Will –1
Defenses elemental adaptation, swarm defenses; Immunities ooze immunities, swarm immunities; Resistances electricity 5
Weaknesses elemental adaptation


Speed 10 ft.
Melee swarm attack (1d4+5 B plus viscous)
Space 10 ft.; Reach 0 ft.
Offensive Abilities chemical slime, distraction (DC 11), viscous


Str +4, Dex +0, Con +2, Int —, Wis +1, Cha –4
Skills Athletics +5, Stealth +5
Other Abilities mindless


Chemical Slime (Ex)

Any living creature that begins its turn affected by an alchemical ooze swarm’s viscous ability also suffers a secondary effect lasting 1 round (DC 10 Fortitude negates).

This is a mind-affecting, poison effect.

  • Choleric: Choleric oozes are composed of caustic chemicals rather than mind-affecting poison. Any living creature that begins its turn affected by the swarm’s viscous ability takes 1d4 acid damage. Armor or clothing worn by the creature takes the same amount of acid damage unless the wearer succeeds on a DC 11 Reflex save. In addition, a wooden or metal weapon that strikes a choleric ooze swarm takes 1 acid damage unless the weapon’s wielder succeeds on a DC 11 Reflex save. The ooze’s touch deals 8 acid damage per round to wooden or metal objects, but the ooze must remain in contact with the material for 1 round in order to deal this damage.
  • Melancholic: Composed of chemical depressants, affected creatures are paralyzed.
  • Phlegmatic: Composed of volatile mind-altering compounds, affected creatures are confused.
  • Sanguine: Composed of euphoric hallucinogens, affected creatures laugh uncontrollably and are treated as staggered.

Elemental Adaptation (Ex)

Each type of alchemical ooze swarm is resistant and vulnerable to different types of energy.

  • Choleric: Vulnerability to electricity and resist acid 5.
  • Melancholic: Vulnerability to acid and resist electricity 5.
  • Phlegmatic: Vulnerability to fire and resist cold 5.
  • Sanguine: Vulnerability to cold and resist fire 5.

Viscous (Ex)

Whenever an alchemical ooze swarm makes a swarm attack against a creature of Small size or larger, that creature must succeed on a DC 11 Reflex save or be covered in patches of sticky ooze globules. Those who fail are entangled until the patches of ooze are removed. The ooze can be removed by spending a full-round action to fling off the globules. If a creature affected by this ability takes any amount of energy damage, per they type of ooze, the ooze patches are immediate destroyed.

  • Choleric: Destroyed by electricity damage.
  • Melancholic: Destroyed by acid damage.
  • Phlegmatic: Destroyed by fire damage.
  • Sanguine: Destroyed by cold damage.


Environment any underground
Organization solitary, pair, or glob (3–4)

Formed from accumulations of runoff from arcane manufactories and laboratories and regions of technomagical calamity, alchemical oozes are fist-sized blobs of volatile chemicals. Although composed of unpredictable compounds and toxins, these mobile oozes pose little threat individually, but in polluted quagmires and tainted sewers can collect in numbers great enough to threaten creatures many times their size.

Swarms of the slimes linger in such contaminated areas and seek new accretions of vital solutions, like those found within the bodies of higher life forms, to fuel their erratic life cycles. Found in numerous varieties with a host of differing abilities, these weird, clinging oozes have been differentiated by likening them to the humors said to compose the bodies of living beings.

Appearing at first to be a collection of tiny blobs of viscous, translucent fluid, alchemical oozes become far more terrifying once their hungry nature becomes apparent. Each swarm is composed of several hundred palm-sized balls of ooze that all scuttle along as a single unit.

Section 15: Copyright Notice

Alien Bestiary (Starfinder) © 2018, Legendary Games; Lead Designer: Jason Nelson. Authors: Anthony Adam, Kate Baker, John Bennet, Eytan Bernstein, Robert Brookes, Russ Brown, Duan Byrd, 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, Alistair J. Rigg, Alex Riggs, Wendall Roy, Mike Shel, Neil Spicer, Todd Stewart, Russ Taylor, Rachel Ventura, Mike Welham, George Loki Williams, Scott Young.