The Handbook of Slime Rheology

How to use

• See page 9 for more details.
• [Encounter #] = 2d4 + total PC levels in party + [x]*
• x = 1, +1 for each time you roll, (as you go deeper)
• No long rests. Even numbered roll means that after the encounter, it is a suitable location for a short rest.
• After 3 rolls, you are deep enough to encounter Tarr. use the Tarr table for encounters number 15 and 26-31.

Rock Slime

Medium ooze, unaligned

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• Armor Class 10 (natural armor)
• Hit Points 36 (10d8)
• Speed 35 ft. (equal to current hit points, at least 5 ft.)

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STR	DEX	CON	INT	WIS	CHA
15 (+2)	10 (+0)	14 (+2)	2 (-4)	6 (-2)	1 (-5)

---

• Damage Resistances force
• Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
• Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
• Languages --
• Challenge 1/2 (100 XP)

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Amorphous. The slime can move through a space as narrow as 1 inch wide without squeezing. The slime loses this ability when its natural armor AC is 15 or more.

Spider Climb. The slime can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check. The slime loses this ability when its natural armor AC is 15 or more.

Rheopectic Hardening. The first time each turn the slime, bludgeoning, slashing, or piercing damage, the AC of its natural armor increases by 5. If the triggering damage was force or cold, increase the AC of its natural armor by 10. Once the slime's natural armor AC reaches 25, the slime is petrified.

Actions

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage or 6 (1d6+2) bludgeoning damage if the ooze's natural armor AC is 15 or more.

Worm Slime

Small ooze, unaligned

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• Armor Class 14 (natural armor)
• Hit Points 63 (14d6 + 14)
• Speed 35 ft

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STR	DEX	CON	INT	WIS	CHA
15 (2)	14 (2)	12 (1)	8 (-1)	6 (-2)	1 (-5)

---

• Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
• Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
• Languages --
• Challenge 1 (200 XP)

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Amorphous. The slime can move through a space as narrow as 1 inch wide without squeezing.

Spider Climb. The slime can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Actions

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage, and the target is grappled (escape DC 12), but can still move at half its speed. Until this grapple ends, the target is blinded, and the slime can't use its psuedopod on another target.

Ingestion (Recharge 6). One humanoid that the slime is grappling must succeed on a DC 13 strength saving throw or be possessed by the slime; the slime dissapears down the target throat, and the target is incapacitated and loses control of its body. The slime now controls the body but doesn't deprive the target of awareness. The slime can't be targeted by any attack, spell, or other effect and it retains its Intelligence, Wisdom, Charisma, and immunity to being charmed and blinded. It otherwise uses the possessed target's statistics, but doesn't gain access to the target's knowledge, class features, or proficiencies.

   The target can make a strength contest against the slime each turn, incapacitating the slime on a success. If the target takes 10 damage or more on a single turn, the target can make a DC 14 Constitution saving throw at the end of that turn to regurgitate the slime, which appears in a space within 10 feet of the target.

Boom Slime

Medium ooze, unaligned

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• Armor Class 12 (natural armor)
• Hit Points 45 (10d8)
• Speed 35 ft.

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STR	DEX	CON	INT	WIS	CHA
12 (+1)	6 (-2)	10 (0)	2 (-4)	6 (-2)	8 (-1)

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• Saving Throws Con +2
• Damage Immunities fire
• Condition Immunities blinded, charmed, deafened, exhaustion, prone
• Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
• Languages --
• Challenge 1/4 (50 XP)

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Warm Embrace. Any creature that starts their turn within 5 feet of the boom slime takes 3 fire damage.

Uh oh. The slime looks faintly worried about what would happen if it took more damage. The slime concentrates on not exploding as if concentrating on a spell. If it loses concentration before being reduced to 0 hit points, each creature within 5 feet of it must succeed on a dexterity saving throw or take 14 (4d6) blugeoning damage and be pushed 10 foot back, landing prone. The slime automatically fails this saving throw and is launched in a random direction.

Chain Slime

Small ooze, unaligned

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• Armor Class 12
• Hit Points 45 (10d6 + 10)
• Speed 10 ft.

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STR	DEX	CON	INT	WIS	CHA
15 (+2)	14 (+2)	12 (+1)	8 (-1)	6 (-2)	1 (-5)

---

• Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
• Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
• Languages --
• Challenge 1/2 (100 XP)

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Amorphous. The slime can move through a space as narrow as 1 inch wide without squeezing.

Spider Climb. The slime can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Coordinated Slime The slime goes on the highest initiative count of the chain slimes that it are within 5 feet of. At the start of its turn, the slime can re-balance health across all adjacent chain slimes. The slime has advantage on an attack roll against a creature if at least two Chain slimes are within 5 feet of the creature and the slimes are not incapacitated.

Actions

Pseudopod. Melee Weapon Attack: +4 to hit, reach 10 ft., one target. Hit: 5 (1d6+2) bludgeoning damage, and the target is grappled (escape DC 12), and pulled 5 feet.

Reactions

Huddle. If this slime has at least two chain slimes within 5 feet of it, it can hundle together to reduce the damage of an effect that requires it to make a dexterity saving throw. If the slime is subjected to an effect that allows it to make a saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails .

Rad Slime

Medium ooze, unalighned

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• Armor Class 16 (natural armor)
• Hit Points 65 (10d8 + 20)
• Speed 25 ft.

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STR	DEX	CON	INT	WIS	CHA
13 (+1)	15 (+2)	13 (1)	2 (-4)	6 (-2)	8 (-1)

---

• Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
• Senses blindsight 30 ft. (blind beyond this radius), passive Perception 8
• Languages --
• Challenge 1 (200 XP)

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Amorphous. The slime can move through a space as narrow as 1 inch wide without squeezing.

Spider Climb. The slime can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Debilitating Aura. A creature that is not a slime that starts their turn within 10 feet of the slime must save on a DC 13 Constitution saving throw or gain a level of exhaustion. All levels of exhaustion gained through this trait are lost once the creature moves out of range of this trait.

Actions

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (2d6) fire damage and 6 (2d6) radiant damage.

Tar Slime

Large Ooze, chaotic evil

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• Armor Class 14
• Hit Points 114 (12d10 + 48)
• Speed 10 ft.

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STR	DEX	CON	INT	WIS	CHA
17 (+3)	15 (+2)	18 (+4)	8 (-1)	8 (-1)	16 (+3)

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• Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
• Senses blindsight 60 ft. (blind beyond this radius), passive Perception 9
• Languages --
• Challenge 3 (750 XP)

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Death Tar. Creatures inside the slime can't be seen from the outside, have total cover, are blinded, and are grappled (escape DC 15). A creature within 5 feet of the slime can take an action to pull a creature or object out of the slime. Doing so requires a successful DC 12 Strength check, and the creature making the attempt takes 10 (3d6) necrotic damage. A creature that starts its turn inside the slime makes a death saving throw. They don't gain one hit point on a roll of a 20, and when they would become stable their death saving throws reset.

Terrible Agglomeration. An slime that is subject to the Death Tar effect insantly dies, and the Tar slime gains that slimes traits, senses, actions, speeds, and reactions. The Tar slime gains half the hit points of the target as temporary hit points. Its AC cannot be raised above 15 by this trait.

Actions

Multiattack. The slime makes 3 Slag attacks at different targets.

Slag. Melee Weapon Attack: +5 to hit, reach 20 ft., one target or one 5 ft. by 5 ft. section of terrain. Hit: 7 (1d8 + 3) bludgeoning damage. On a hit the target is pulled 5 feet towards the slime, into the slime if it started within 5 feet. On a miss or if the target was terrain, the slime is pulled 10 feet closer to the target. While doing so, it can enter Large or smaller creatures' spaces. Whenever the cube enters a creature's space, the creature must make a DC 12 Dexterity saving throw. On a successful save, the creature can choose to be pushed 5 feet back or to the side of the cube.

Slough. Any creature inside the slime take 21 (6d6) necrotic damage. The slime removes one negative condition affecting it.

Module Summary (show to players)

You're travelers from the east, come to participate in the Slime Rush! Precious "Mosaic" slimes have been discovered in caves all around the city, and adventurers have been journeying down into these depths, attempting to gather them up to resell at the surface. Its dangerous work, but those who succeed return with fame and fortune.

You're a group of childhood friends looking for work after your town was destroyed by some crazy implausible event. You hope this will be the start of your career as adventurers. Little do you know... something unnatural is happening below.

Preamble (Read to players)

As your party makes their way to the town of [Slime County], you bump along other adventurers on their way. They bring with them the smell of opportunity, of comradaire and competition, of gold to be earned and a fortune to be had.

Strolling through the outskirts of town, your party finds but a hodgepodge of tents, hastily constructed taverns, and newly created roads. The influx of travelers has brought much work to the local carpenters, blacksmiths, and taverns.

You enter the center of this sprawl, meet your contact, a dwarvern guide called [Alaxal], who takes you down to the entrance of the mines, and tells you about whats been happening as of late: how this used be a smaller mining town, how the mines were always coinhabited by the slimes, but now they were getting aggressive and moving up from the depths.

"Well.. here you have it. Down this 'ere tunnel you'll get to the mining station. Further past that it should lead into the crystal caverns. Look out for 'em Mosaic Slimes, in a pinch you'cn quaff 'un fer some health but they sell for 50 gilds apeice up above." After a bit of an awkward pause, you pay the guide his commission, and move to enter the mines.

"Oh by the way... try not to delve too deep. We've been hearing of something dangerous down deep, might have to do with the slimes"

Clues

It turns out that the reason why the slimes have been pushed out is because the fungus that they feed out is dying out, and they are being attacked by Tarr slimes, which is what happens when slimes resort to cannibalism. This mystery is represented by a skill challenge (DC15, at least 3 successes before 3 failures). Here are some things that proc a roll:

• Attempting to socialize with the slimes
• Dissecting a slime (discovers incompatibility of the slime)
• Generally, anything to do with investigating slime ecology
• Making a discernible effort to learn more about the slimes by talking to Splash or your guide
• Attempting to feed a slime with fungus found in the upper levels of the mind.

Using a spellslot while doing one of these things will result in an automatic success.

Layout

Other rewards

After killing the slime and taking a sample of its substance, you can return to Splash who analyzes it and confirms the dark secret of the tarr. Later on you can send resources back to Splash.

Splash will to try to help the slimes by growing their food and feeding the slimes, and try to convince adventurer's to hunt and kill tar slimes through bounties. After several months and a total of 10000 gold you can set up a stronghold in these caverns for you and your slime buddies.

Tarr Encounters

Describe the Tarr engaging with another slime, and describe some of the attributes of the slime being adapted by the Tarr. The slime may try to put up a fight with the Tarr, giving the party some time to attack the Tarr without being focused.

Slimefly interactions

Slimes in a slimefly can exit the slime of their own volition, falling to a space directly below the slime (and taking fall damage when applicable). A slimefly with no slime in it can still use its ranged attack, and just flings projectile slime.

In the first turn, the slimefly can only fling one slime, whereas all the slimes in it could potentially go. For encounters involving a few slimefly loaded with other slimes, you can consider letting a carried slimes use the slimefly's attack be expending both reactions.

Chain Slime and CR

You can run this mostly assuming the chain is preserved, and calculating a hit point pool of 200 (assuming 4 slimes). The hit points of each piece is made an even number for this reason. Then when the slime chain is broken, you can divide up the remaining hp equitably.

The CR for the chain slimes assumes that you the players don't fight the chain slime while it is combined - doing so makes it better modeled as a single higher CR creature which is much deadlier.

Honey Slimes and nonlethality

Honey slimes are great for adventurers getting their feet wet but require other threats to be relevant. If a encounter requests an encounter with few other threats, you should add some environmental hazards or traps. This is also somewhat true for Worm slimes (a narrow cliff over an underground chasm tends to increase the tension)

Boom Slimes actionless

Not a typo, Boom slimes just don't have any meaningful attacks! Remember, all creatures can take the shove action or dodge action although I think boom slimes are generally more eager to attempt the latter.