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Terraria Wiki
This is a Guide page.
This is a Guide page.
This means the page will walk you through a specific task, strategy, or enemy/boss fight.
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  • King Slime Trophy.png "The lord of all things slimy." King Slime Trophy.png

    King Slime is an optional Pre-Hardmode boss. Due to its low stats and predictable attacks, it is considered the easiest boss in the game by most players.

    King Slime
    King Slime.gifOld-gen console version and Nintendo 3DS version
    Map Icon King Slime.png
    Map Icon
    Classic mode icon.png Classic
    Expert mode icon.png Expert
    Master mode icon.png Master
    AI TypeKing Slime AI
    Max Life2000/2800/3570
    KB Resist100%
    Immune toPoisonedConfused

    Spawn Condition[]

    King Slime can be spawned by fulfilling any of these conditions:

    • Rarely in the outer lateral sixths of the map, during daytime, and only on grass, replacing a normal Slime's spawning;
    • Naturally by Natural-occurring Slime Rain;
    • Using Slime CrownSlime Crown.

    It must then be defeated before all the involved players die.


    King Slime is very similar to a normal Slime: it moves by hopping to the player and attempts to make contact for damage. Unlike other Slimes, however, it has a large amount of health, it can teleport, and it's much larger than a standard Slime. This makes King Slime an easy target, but he jumps far and unpredictably; the height varies depending on the distance between him and the player. Failing to predict his jump destination can result in the player getting damaged.

    Getting too far away from King Slime will make it teleport to the player, meaning that the player cannot escape by simply running offscreen. However, this can be taken advantage of, as it can get stuck in enclosed spaces.

    As King Slime gets damaged, it gets smaller. This makes it more mobile and harder to hit, making it easier to escape enclosures (should it fail, however, it might teleport instead), and it spawns Blue SlimeBlue Slimes to harass the player. These can make the player waste ammo on them instead of the King Slime, so the use of piercing weapons or ammo is important.

    Old-gen console version Old-gen console and 3DSNintendo 3DS version[]

    The main difference between these versions with Desktop version Desktop, Console version Console, Mobile version Mobile, Nintendo Switch version Switch, and tModLoader version tModLoader is that it does not teleport; it can be eternally stuck in small to medium-sized enclosures if it spawns there. Aside from this, it's mostly the same

    Expert mode[]

    There are not many changes to King Slime itself besides its higher Damage and Health. However, when damaged it will spawn Spiked SlimeSpiked Slimes in addition to regular Blue Slimes. Those can throw volleys of spikes at a short distance, so having a weapon which can pierce multiple targets and attack from a range will be necessary to avoid being bombarded to death.

    General Strategies[]

    Terrain Preparation[]

    King Slime is one of the few bosses in the game that lack the ability to go through blocks. This can be exploited in multiple ways:

    • On tModLoader version tModLoader version, climbing on a RopeRope 35 blocks above the ground allows the player to attack him at range safely without him teleporting onto the player. Add extra rope to give the player a margin of error, or to retreat and heal if need be. Using this method makes potions, higher damaging weapons, armor, and movement accessories optional, as the player will not need to dodge attacks or mitigate damage.
    • Make one or two platforms above the ground; King Slime will eventually teleport to ground level and the player can easily hit him from the platforms.
    • A flat area with small room below it with Platforms as roof for the player. King Slime can't enter small rooms and thus cannot reach the players in it.

    It is possible to exploit the King Slime's large size in Old-gen console version Old-gen console and 3DSNintendo 3DS version versions by trapping him between blocks.

    CampfireCampfires are easy to obtain and provide a regeneration boost. Heart LanternHeart Lanterns can also be used, but are much harder to craft. SunflowerSunflower and Bast StatueBast Statue increase movement speed and defense respectively, and should be used if obtained. A Star in a BottleStar in a Bottle increases mana regeneration, which is useful for mages.

    Since King Slime spawns Blue SlimeBlue Slimes, a Blue Slime BannerBlue Slime Banner may be a good idea to provide offensive and defensive buffs.

    Defense: Gearing Up[]


    Armor is not very important in this fight. However, it is recommended to have at least Cactus HelmetCactus Armor, as it is easy to obtain and provides a decent amount of defense. More armor is always better. However, in Expert or Master Mode, better armor is recommended due to King Slime's buffed HP and attack power.

    Melee (And Mixed in Expert or Master Mode) users should either get Silver HelmetSilver Armor, Tungsten HelmetTungsten Armor, Gold HelmetGold Armor or Platinum HelmetPlatinum Armor.

    Rangers (or Throwers on the tModLoader version tModLoader version) can get Fossil HelmetFossil Armor.

    Mages can either use Wizard HatWizard set or Jungle HatJungle armor.

    Summoners are recommended to get the Flinx Fur CoatFlinx Fur Coat.


    Most weapons can be used to fight this boss without difficulties. Piercing weapons may be preferred, to hit both the Blue Slimes and the King Slime himself.


    Like weapons, most accessories can help, but accessories obtained in chests are usually enough to defeat King Slime.


    Specific Strategies[]

    No Teleports Strategy / Minecart Strategy[]

    • Build a one-block thick wall 18-20 blocks high;
    • Create a walkway between 35-50 blocks long with platforms for maneuverability;
    • Make sure a CampfireCampfire is nearby.
    • Use any long-range weapons (Yo-yos, Bows, Gem Staves or Throwing weapons).
    • Make a minecart track (above the typical platform where the player summons King Slime) and put bumpers on the end. King Slime will have a hard time trying to teleport to the player because of the speed attained on a Minecart.

    Lava Pit Strategy[]

    Because the King Slime can be harmed by Lava, a good strategy is to use a Lava BucketLava Bucketto make a long strip of land with a small amount of lava (shallow enough so items don't burn) and then make some widely placed platforms. the player can jump, use Rocket Boots, or employ a Grappling Hook to move between platforms. Just be careful to not jump in the lava if you don't plan to use Obsidian Skin PotionObsidian Skin Potions. This strategy works with his teleports, and the minions will all die from falling in the lava. The player doesn't have to focus on fighting, because the lava will dish out major damage. The player can also skip the platforms and use a Obsidian Skin Potion, and just evade by running under King Slime, or use Rocket BootsRocket Boots to fly over.

    King Slime taking damage posthumously by a Crimson Rod in the death box.

    Death Box Strategy[]

    In Old-gen console version Old-gen console, 3DSNintendo 3DS version, and tModLoader version tModLoader editions, upon the player's death, the King Slime will attempt to travel off-screen in order to despawn. However, the King Slime cannot travel through solid blocks, so he can easily be trapped in a small area until death.

    • A solid box must be constructed. The box should be large enough to hold the King Slime, yet not so large that he can still wander off-screen.
    • A bed should be placed within the box. In order to make the bed usable, it may be easiest to build a small cubicle within the box to hold the bed.

    Before the King Slime spawns, the player should be inside the box with his spawn set on the bed. Once the King Slime awakens, he will teleport within the box to attack the player. The player should deal any damage he can to the King Slime at this time. The King Slime should inevitably kill the player and attempt to hop off screen. However, he will find himself trapped in the box and will not be able to leave. The player will respawn at the bed and is free to deal any additional damage to the King Slime before his next death. Repeat this process until the King Slime is defeated.

    Weapons and traps that can deal damage to the King Slime during a player's death will greatly speed up the battle, such as the Crimson RodCrimson Rod, Dart TrapDart Traps, or a thin layer of lava.

    Since this strategy revolves around the player's death, hardcore players should avoid implementing this strategy.

    1. 1.0 1.1 Information taken from the Desktop version Desktop source code, method RegisterBoss_KingSlime() in Terraria.GameContent.ItemDropRules.ItemDropDatabase.cs. There may be inaccuracies, as the current Desktop version Desktop version is