Archives of Nethys

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Template Grafts | Universal Monster Rules

Entropy Slug

Source Starfinder #9: The Rune Drive Gambit pg. 58

Entropy Slug CR 4

XP 1,200
NE Medium magical beast
Init -1; Senses blindsense (scent) 60 ft., darkvision 60 ft., low-light vision; Perception +10


HP 50
EAC 16; KAC 18
Fort +8; Ref +3; Will +6
Immunities acid
Weaknesses susceptible to salt


Speed 20 ft.
Melee slam +13 (1d6+9 B plus entropic mucus; critical deteriorate [DC 13])
Ranged corrosive spittle +10 (1d6+3 A; critical corrode 1d6)


STR +5; DEX -1; CON +4; INT -3; WIS +0; CHA +0
Skills Athletics +10, Stealth +10
Other Abilities entropic mucus


Environment underground or urban (Great Shadar)
Organization solitary, pair, or cornucopia (3–30)

Special Abilities

Corrosive Spittle (Ex) An entropy slug can spit acid as a ranged attack with a range increment of 30 feet.

Deteriorate (Su) When an entropy slug deals a critical hit with its slam attack, the target must succeed at a DC 13 Reflex saving throw or all its hybrid and technological weapons, armor, and gear gain the broken condition for 1d4 rounds. Items with the analog property are unaffected.

Entropic Mucus (Ex) When an entropy slug hits with a slam attack or moves, it leaves behind mucus on the creature it hit or in every square the slug moved through. A creature hit by the slug’s slam attack or that enters a square covered in entropic mucus must succeed at a DC 13 Reflex save or each battery in the creature’s possession loses 1d4 charges. This mucus remains active until it forces one such saving throw or 1 minute has passed, whichever comes first.

Susceptible to Salt (Ex) A handful or more of salt or a splash of salt water deals 1d6 damage to an entropy slug, and full immersion in salt water deals 4d6 damage per round.


Originating from Great Shadar, entropy slugs are large, terrestrial mollusks infused with the force of the gradual decline of order. They naturally congregate in abandoned industrial complexes, derelict slums, or junkyards where neglected sources of technology linger. However, draeliks and other species like to use them as guard animals, taking care to keep them away from any important electronic devices.

A typical entropy slug is about 5 feet long from eyestalk to tail and weighs 300 pounds.

Entropy Slug Mucous Gland

An entropy slug’s mucous gland can be used to craft a special hybrid grenade known as a drain grenade. The mucous gland of a slain entropy slug can be harvested with a successful DC 25 Life Science check that takes 1 minute, garnering raw materials worth 700 UPBs that can be used only to craft a drain grenade. If you fail this check by 5 or more, you suffer the effect of a drain grenade. This check can be attempted only once per entropy slug.