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Template Grafts | Universal Monster Rules

Detonation Ooze

Source Starfinder #36: Professional Courtesy pg. 58

Detonation Ooze CR 9

XP 6,400
N Large ooze
Init +3; Senses blindsight (vibration) 60 ft., sightless;; Perception +17


HP 145
EAC 22; KAC 24
Fort +13; Ref +9; Will +6
Immunities ooze immunities


Speed 20 ft.
Melee pseudopod +21 (1d10+13 B plus 1d10 F)
Space 10 ft.; Reach 5 ft.
Offensive Abilities detonation, engulf (2d10+13 B, DC 16)


STR +4; DEX +3; CON +6; INT —; WIS +0; CHA -2
Other Abilities unstable expansion


Environment any urban (manufacturing plants)
Organization solitary

Special Abilities

Detonation (Ex) When the detonation ooze is reduced to 0 HP, the destabilized chemicals that make up its body trigger a violent explosion. The ooze detonates in a 20-foot burst, dealing 2d10+13 fire damage (Reflex DC 16 half) to creatures within the radius, including those currently engulfed.
The explosion can’t be prevented entirely, but the damage can be mitigated. If at least 30 points of cold damage are dealt to the ooze over the course of the encounter, the volatile chemicals cool and partially stabilize, making the final detonation instead deal only 1d10+13 fire damage (Reflex DC 16 half).
Unstable Expansion (Ex) A detonation ooze is made of highly unstable chemical compounds that begin to break down as the ooze takes damage. As a reaction when a detonation ooze is reduced to 100 HP, its size increases to Huge. When it expands, it can attempt to engulf any Medium or smaller creature in the new squares it grows to occupy; it can't grow to occupy squares that are occupied by Large or larger creatures, and if there is no room for the ooze to expand, unstable expansion fails. The process repeats when the detonation ooze is reduced to 50 HP, except that its size increases to Gargantuan if it was already Huge, or Huge if it was still Large.


Factories across the galaxy pump out thousands upon thousands of tons of industrial waste every day as they seek to fuel the rapid technological consumption of spacefaring worlds. The question of what to do with that waste remains a constant concern; more unscrupulous facilities simply dump the chemical remnants resulting from industrial processing. Sometimes, complex interactions within the runoff from munitions factories lead to the formation of a detonation ooze, a highly volatile slurry of industrial waste given its own strange semblance of life.

When its chemical makeup is stable, a typical detonation ooze is about 12 feet across and weighs anywhere from 800 pounds to 2 tons, depending on the amount of the trace metallic compounds in its mass. The ooze’s weight remains the same even as it expands, leading to what some survivors have described as a runny consistency the larger the ooze gets. Accompanied by the occasional small explosion from within its amorphous body, a detonation ooze is an unmistakable danger.

Detonation oozes have proven to be a deadly and consistent threat to industrial workers and waste cleanup crews near the factories where they spawn. When one is spotted, freelance hazard teams are often sent in to deal with the problem, hopefully with adequate protection.