Behavior

This is a technical page, which may have unmarked spoilers.

Technical pages document the mechanics of Rain World in much greater detail than is necessary to know for most purposes.

Technical pages may also make use of terms defined in the technical glossary.

Creatures in Rain World vary widely in shape and size, but also have distinct behavior patterns. Creatures have vastly complicated AI, and their behavior can be divided into three different categories: Relationship, Reputation, and Personality.

Relationship

A Pink Lizard's RelationshipTracker

Most creatures in Rain World use what is called a RelationshipTracker, which is triggered upon a creature realizing another is nearby. These Relationships, and their values, are what determine how a creature behaves and interacts with the world. Relationships are mapped with a range of 0-1, with a 0 having no effect on behavior, and a 1 having the highest possible effect.

The following list is all possible Relationships a creature can have with another:

• Ignores - Causes the creature to act as though the target isn't there.
• Eats - Causes the creature to attempt to kill the target and carry its corpse to a den if applicable.
• Afraid - Causes the creature to run away from the target.
• StayOutofWay -
• AgressiveRival - Only used by lizards and causes them to attack each other when they're too close, usually resulting in one of them retreating.
• Attacks - Causes the creature to attempt to kill the target.
• Uncomfortable -
• Antagonizes -
• PlaysWith - Causes Squidcadas to ocasionally play with each other by flying in circles
• SocialDependent - Only used on the player, causes creatures to have a dynamic reputation to the player.
• Pack - Causes the creature to stay near the target

Relationships are not static, and vary depending on Reputation, Personality, and player behavior.

• 

  A Pink Lizard's Eats relationship with Slugcat increasing on contact

• 

  A Pink Lizard's Eats relationship with Slugcat increasing after being attacked

• 

  A Scavenger's Afraid Relationship turning to Pack after receiving a gift

• 

  A Scavenger becoming Afraid of Slugcat after they steal a Spear

• 

  A Scavenger's Relationship with Slugcat changing with movement and proximity

Trackers

Two fighting Green Lizard's Trackers.

Trackers typically correspond to Relationships. Some creatures have unique Trackers, such as a Dropwig's CeilingSitModule. The following are the most commonly used Trackers:

• ThreatTracker - Afraid Relationship
• PreyTracker - Eats and Attacks Relationships
• RainTracker - fear of rain

• InjuryTracker - how hurt a creature is
  • Lizards have a unique LizardInjuryTracker
• AgressionTracker - AgressiveRival value, as well as how much a creature wants to fight with their rival
• NoiseTracker - heard sounds and a creature's desire to explore them
• FriendTracker - creatures' desire to follow a 'friend'
  • This Tracker is used for tamed Lizards instead of a Relationship. In Downpour, it is also used for Slugpups.

Reputation

Certain creatures in Rain World have a Reputation system and display different behaviors as a result. This system is entirely invisible to the player outside of The Chieftain passage and, to a degree, taming Lizards. Different actions cause varying fluctuations in Reputation; helping a Scavenger or trading items causes Reputation to increase, while theft or violence causes a decrease.

Reputation is broken down into four different variables:

• Regional Reputation - your Reputation within the current Region
• Global Reputation - affects the behavior of all creatures in the world
• Filtered Local - the player's current effective Reputation
• All Reputation - used for Reputation calculations
  • Low All Reputation increases Reputation loss from violence.

• • Low All Reputation reduces Reputation gain from kindness.
  • High All Reputation reduces Reputation loss from violence.
  • High All Reputation increases Reputation gain from kindness.
  • All Reputation does not affect Scavengers.
  • All Reputation is impacted by killing any kind of creature, except for Batflies and Vulture Grubs, even those without Reputation.
    • This does not work vice versa. All Reputation can only be raised through positive interactions with a creature that uses the Reputation system.

• 

  Survivor's Reputation table

• 

  Survivor's Reputation table, featuring Downpour's regions

At its simplest, low Reputation causes aggression and fear, while high Reputation causes neutrality and friendliness.

The table below lists all creatures with a Reputation system and their resulting relationships:

Creature	Low Reputation Relationships	Starting Relationships*	High Reputation Relationships
Scavengers	Afraid, Attacks	Afraid, Attacks, Ignores, Uncomfortable	Pack
Lizards	Eats	Eats	Ignores
Squidcadas	Antagonizes, StayOutofWay, Afraid	Antagonizes, StayOutofWay, Afraid	Ignores
Garbage Worms†	N/A	Ignores	N/A
Jetfish	Ignores, Antagonizes, Afraid‡	Ignores, Antagonizes, Afraid‡	Ignores
Rain Deer	Ignores	Ignores	Ignores

* 'Starting Relationships' refers to Survivor's starting Reputation, which is around 0.

† While Garbage Worms are included in the Reputation table, there is no way to raise or lower Reputation with them outside of influencing your All Rep, and even then, their behavior is unaffected regardless. Their aggression is instead caused by a state called angryAt.

‡ Jetfish that have never been in water have an Ignores Relationship with the player. Jetfish become Afraid of the player for a short amount of time after being thrown.

Personality

Technical Article: Behavior/Personality

Certain creatures, Scavengers and Lizards most notably, have Personality modifiers that change the way they interact with Slugcat and other creatures. The following lists all possible Personality traits:

• Aggression
• Bravery
• Dominance
• Energy
• Nervous
• Sympathy

These personality traits can affect each other, appearance, and relationships. The following tables list all effects that Personality has on creature behavior:

Aggression

Effects

High values increase:

• Dominance

High values make Scavenger:

• Better at dodging
• Better at mid-range combat
• More likely to attack Slugcat and other threatening creatures
• More likely to attack lethally
• Have shorter Spear throw wind-ups
• More likely to spawn with Rocks
• More likely to spawn with Explosive Spears
• More likely to have longer teeth
• More likely to have narrower necks

Low values make Pole Plants:

• More likely to retreat into dens when injured

Downpour

High values make Slugpups:

• Want to hold Grenades and Singularity Bombs
• Like eating Infant Noodleflies, Lilypucks, and Fire Eggs
• Dislike eating Bubble Fruit, Slime Mold, Infant Centipedes

Bravery

Effects

High values increase:

• Aggression
• Dominance

Low values increase:

• Nervous

High values make Scavengers:

• Better at blocking Spears
• More likely to attack creatures they fear
• Less likely to spontaneously attack fast-moving creatures nearby
• Less likely to throw weapons to free themselves from Lizards or Vulture bites
• Less uncomfortable when hearing unknown noises
  • More likely to investigate unknown noises

• More likely to idle around other creatures
• Less afraid of Slugcat

Low values make Scavengers:

• More likely to follow closely behind pack leaders
  • More likely to move faster towards pack leaders
• More scared when spears thrown by unseen creatures
• React more intensely when startled
• Less afraid of Slugcat, but only when wielding a weapon
• Eyes boggle when very scared at values < 30%

Values >50% make Squidcada:

• Never run from the player

Downpour

High values make Slugpups:

• Like eating Adult Centipedes, Neuron Flies, and Dandelion Peaches
• Dislike eating Popcorn Plants, Vulture Grubs, and Gooieducks

Dominance

Effects

High values make Scavengers:

• More likely to be the pack leader
• More likely to throw warning shots
• Less likely to spawn with Rocks
• More likely to spawn with more Spears
• More likely to spawn with Explosive Spears
• Go over lower dominance Scavengers when moving past each other

• More likely to have longer back frills
• More likely to have larger eartlers
• More likely to have fatter bodies

Low values make Scavengers:

• More likely to abandon their current task to look for pack leaders
• Less likely to follow high dominance Scavengers
• Avoid standing near higher dominance Scavengers when attacking the same target
• Avoid pathfinding through space near higher dominance Scavengers
• Less likely to communicate with the same creature a higher dominance Scavenger is communicating with

High values make Lizards:

• Up to 10% more difficult to tame
• More likely to be the leader in a Yellow Lizard pack.

Low values make Lizards:

• Up to 10% easier to tame

Low values make Eggbugs:

• Follow higher value Eggbug after collision

High values make Dropwigs:

• More likely to consider Spears for bait

Low values make Dropwigs:

• Follow higher value Dropwigs after collision
• Abandon their perch after collision with a higher value Dropwig that wants it

High values make Big Spiders:

• Choose a new idle spot after a collision
• Share its current ShyFromLight cycle with all other Big Spiders in sight

Low values make Spitter Spiders:

• Less likely to stop near Big Spiders when spitting

High values make Rain Deer:

• Have larger antlers

Low values make Rain Deer:

• Unlikely to rest near deer with low values
• Unable to steal Spore Puffs from higher value Rain Deer
• Kneel to higher value Rain Deer

Low values make Miros Birds:

• Less likely to raid the same room as a higher value Miros Bird

Low values make Guardians:

• Less likely to stand near high value Guardians

Downpour

High values make Slugpups:

• Want to hold Cherrybombs, Batnip, Spore Puffs, Flashbangs, Noodlefly Eggs, Bubble Weed, and Gooieducks
• Pick up more items
• Stand near other Slugpups
• Like eating Eggbug Eggss, Popcorn Plants, and Vulture Grubs
• Dislike eating Adult Centipedes and Dandelion Peaches

Energy

Effects

High values increase:

• Nervous
• Aggression
• Dominance

High values make Scavengers:

• Have faster movement speed
  • Have faster animations (retreating, waving through Toll, pointing, idling and trading)
  • Look around faster
• Better at blocking Spears
• Better at mid-range combat

• Have increased reaction skills
• More likely to stray from designated paths when abstracted
• More likely to idle in high-visibility spots
• More likely to have an increased eye slant
  • Open eyes faster
  • More likely to have yellow eyes or accent coloration

Low values make Scavengers:

• More likely to have fatter bodies

High values make Salamanders and White Lizards:

• Less likely to lurk
• More likely to abandon lurking for another action

Downpour

High values make Slugpups:

• Want to hold Pearls, Overseer Eyes, the Green Neuron, and Vulture Masks
• Tug on the player when idle for too long
• More likely to play
• Like eating Jellyfish, Slime Mold, and Infant Centipedes.
• Dislike eating Blue Fruit, Eggbug Egg, and Glow Weed

Low values make Slugpups:

• More likely to nap

Nervous

Effects

High values make Scavengers:

• Better at dodging
• Have faster animations (pointing and looking around)
• Have faster movement speed when not in combat
• More likely to block or dodge weapons that are further away
• Stare at creatures longer before switching focus

• More likely to look at empty spots in a room
• More easily startled by sounds in quick succession
• More likely to move between idle spots on each tick
• Jump more when entering the attentive animation
• Have more jittery hands
• Blink more often

Downpour

High values make Slugpups:

• Want to hold Rock, Cherrybombs, Flashbangs, Spore Puffs, Jellyfish, and Lilypucks
• Appear anxious around other Slugpups
• Like eating Blue Fruit, Glow Weed, and Hazers
• Dislike eating Jellyfish, Neuron Flies, and Lilypucks

Sympathy

Effects

High values decrease:

• Aggression

High values make Scavengers:

• Point for longer
  • More likely to point at threats near pack members
• More likely to attack creatures holding friends
• More likely to treat Slugcat as a friend
• More likely to give weapons to unarmed pack members in combat

• More likely to avoid Slugcat than attack
  • More likely to throw warning shots rather than attacking lethally
• Have larger eyes
  • Have wider eyes
  • More likely to have distinct pupils
    • More likely to focus pupils more directly at what they're currently looking at

Downpour

High values make Slugpups:

• Like eating Bubble Fruit and Gooieducks
• Dislike eating Hazers, Infant Noodleflies, and Fire Eggs

Trivia

• Aggression is misspelled as Agression in the code.
• In v1.5, Jetfish Reputation can only be decreased.
• Killing Lantern Mice causes the highest drop in All Reputation, reducing it by -7.5