Slime Rain

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Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.
BiomeBannerSlimeRain.png
Bestiary Slime Rain.png “Slime is falling from the sky!” Bestiary Slime Rain.png
King Slime spawning during Slime Rain. Note the falling slimes in the background.

Slime Rain is a minor event that consists of frequent spawns of Green, Blue, and Purple Slimes, and rarely Pinky. During the event, all slimes spawned will exhibit hostile behavior towards the player, unlike naturally spawned slimes. Green, Blue, and Purple Slimes will also appear falling in the background. Defeating 150 slimes during the event will cause King Slime to spawn; if he has been defeated previously, he will spawn after only 75 slimes are defeated.

Slime Rain always occurs randomly, signaling its beginning with the status message "Slime is falling from the sky!". It normally lasts between 9 minutes and 15 minutes, though it will end immediately when King Slime is defeated. Slime Rain will not end if the player leaves the world. The status message "Slime has stopped falling from the sky." appears when the event ends.

Details

The duration of a Slime Rain varies with game mode:[1]

  • In singleplayer, a Slime Rain can last anywhere from 9 minutes to 14 minutes 59.98 seconds.
  • In multiplayer, a Slime Rain will always last for 15 minutes.

In order for a Slime Rain to occur, the criteria below must be met.[2] Slime Rain can never be initiated manually.

Additionally:

  • Slime Rain will never occur in Don't dig up and Get fixed boi worlds.[1]
  • When a world is newly generated, Slime Rain will not occur within a period of time, which is randomly determined to last between 24 minutes and 48 minutes.[3]
  • In singleplayer, there is a cooldown period after a Slime Rain ends during which another Slime Rain cannot occur. This cooldown is randomly determined after each occurrence of the event and lasts between 84 minutes and 3 hours.[4]
    • In multiplayer, no restriction is applied. Another Slime Rain may occur immediately after a Slime Rain ends.

A Slime Rain can only occur between 4:30 AM and 12:00 PM. It has a 1/225,000 chance of occurring each tick[5] during this time, resulting in a chance of 3/25 (12%) each day. The chance is decreased in Hardmode, as well as if King Slime has already been defeated, and for Expert Mode players that do not meet the criteria:

Chance of Slime Rain per day
(Pre-Hardmode)
King SlimeKing Slime
not defeated defeated
Classic Mode
or criteria met 		3/25 (12%) 3/50 (6%)
Criteria not met 3/125 (2.4%) 3/250 (1.2%)
Chance of Slime Rain per day
(Hardmode)
King SlimeKing Slime
not defeated defeated
Classic Mode
or criteria met 		2/25 (8%) 1/25 (4%)
Criteria not met 2/125 (1.6%) 1/125 (0.8%)

For instance, given an Expert pre-Hardmode world where King Slime has already been defeated but no player has met the health/defense criteria yet, the daily chance of Slime Rain in that world will be 3/250 (1.2%).

Contents

Characters
Unique Drops
Music

Notes

  • Only Blue Slimes and any of their variants that share the primary NPC ID of 1 count toward the event's kill count: Jungle Slime, Yellow Slime, Red Slime, Purple Slime, Black Slime, Baby Slime, Pinky, and Green Slime.
    • Statue-spawned slimes do count towards the kill count.
    • Slimes can be killed in any way, including lava, traps, and attacks by town NPCs.
  • Manually summoning King Slime (via a Slime Crown) and defeating him during a Slime Rain also terminates the event.
  • If the player kills enough slimes for King Slime to spawn (150 or 75) but lets the boss despawn without defeating it (e.g. by leaving and reentering the world), then the Slime Rain will continue. In this case, the kill counter is reset and after enough slimes are killed again, King Slime will spawn once more.
    • The number of killed slimes required for subsequent King Slimes to spawn after the first one is raised to 225, or 102 if King Slime had already been defeated prior to the event.[6]
  • The Sticky Situation achievement will not be awarded if the event ends without King Slime having been defeated.
  • If the player is in a biome that features special variants of slimes (such as Ice Slimes), those slimes will not rain from the sky and their normal spawn rates will not be affected.
  • Slimes spawned by the Slime Rain are not affected by the enemy spawn rate slider in Journey Mode.
  • Slime Rain can occur while a boss is alive.

Achievements

Achievement Sticky Situation.png
Sticky Situation • “Survive the slime rain, where gelatinous organisms fall from the sky in droves.”
Defeat King Slime during Slime Rain. (Desktop, Console and Mobile versions)
Category: Explorer Explorer
Achievement Gelatin World Tour.png
Gelatin World Tour • “Defeat every type of slime there is!”
Defeat at least one of every type of slime. (Desktop, Console and Mobile versions)
Category: Challenger Challenger
Achievement Pretty in Pink.png
Pretty in Pink • “Kill pinky.”
Defeat Pinky for the first time. (Desktop, Console and Mobile versions)
Category: Slayer Slayer
Achievement Slippery Shinobi.png
Slippery Shinobi • “Defeat King Slime, the lord of all things slimy.”
Defeat King Slime for the first time. (Desktop, Console and Mobile versions)
Category: Slayer Slayer

Tips

  • The event can be avoided entirely by staying indoors or underground, as it can end without any player interaction after a certain amount of time has passed.
  • The high spawn rate of slimes during a Slime Rain, including Pinky, greatly facilitates farming for Gel, Pink Gel, Slime Staff, and the slimes' banners. King Slime will also offer loot that is useful at the beginning of the game.
  • An enclosed shelter with a 1×1 hole in the wall will allow the player to fire arrows, bullets, and use yoyos from relative safety. However, once King Slime spawns, it is advised to leave, as he can teleport into the shelter and trap the player.
  • The spawn rate can be increased with a Water Candle and Battle Potion. Similarly, it can be decreased with Sunflowers, a Calming Potion, and Peace Candles.
  • Making an arena with at least two layers of blocks or platforms is helpful, as the slimes will fall on the top to be easily farmed by the player. Once King Slime spawns, the player can go under the arena, while the slimes will still be falling on the top of the arena, so they do not get in the way of the boss fight.

Trivia

  • The Slime Rain effect in the background can be seen before the event is announced if the player goes up high enough.
  • Some slimes appear to spawn in the air above the player which results in them falling from the sky, giving the term rain a literal meaning.
  • The Slime Rain is one of two combat-focused events in Terraria that cannot be summoned via the use of an item, the other being the Martian Madness.

Gallery

The slimes seen falling in the background as ambiance during the event:

History

  • Desktop 1.4.4: Increased the chance of occurring by 20%. Can now only occur between 4:30 AM and 12:00 PM.

References

  1. ↑ 1.0 1.1 Information taken from the Desktop version Desktop 1.4.4.9 source code, method StartSlimeRain() in Terraria.Main.cs.
  2. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, method UpdateTime() in Terraria.Main.cs.
  3. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, methods GenerateWorld() in Terraria.WorldGen.cs and BusyWithAnyInvasionOfSorts() in Terraria.NPC.cs.
  4. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, methods StopSlimeRain() in Terraria.Main.cs and BusyWithAnyInvasionOfSorts() in Terraria.NPC.cs.
  5. ↑ A tick is a time unit countable by the software. Most of Terraria's updating logic happens every tick. A tick has the length of 1/60th of a second, hence there are 60 ticks in a second and 3600 ticks in a minute.
  6. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, method DoDeathEvents_AdvanceSlimeRain() in Terraria.NPC.cs.
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