Guide:King Slime strategies

"The lord of all things slimy."

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.

Spawn Condition
King Slime can be spawned by fulfilling any of these conditions: It must then be defeated before all the involved players die.
 * 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.

Battle
King Slime is no different than a normal Slime: it moves by hopping to the player. Unlike other Slimes, however, it has a large pool of health due to its Boss status, and it's huge. 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 its 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 off the screen. 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, having less issues to escape small enclosures (should it fail, however, it might teleport instead), and it spawns lesser 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.

The main difference between these versions with is that it does not teleport; it can be eternally stuck in small to medium-sized enclosures if it spawns there, but is mostly the same.

Expert mode
There are not many changes about the King Slime itself besides its higher Damage and Health. However, when damaged it will spawn 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.

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, climbing on a 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 versions by making him stuck in-between blocks.

are easy to obtain and provide a regeneration boost. can also be used, but are much harder to craft. and increase movement speed and defense respectively, and should be used if obtained. A  increases mana regeneration, which is useful for mages.

Since King Slime spawns, a may be a good idea to provide offensive and defensive buffs.

Armor
Armor is not very important in this fight. However, it is recommended to have at least, 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, , or.

Rangers (or Throwers on the version)  can get.

Mages can either use or.

Summoners are recommended to get the.

Weapons
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.


 * As a Melee character, basic metal swords are a bad idea due to the amount of Slimes the King will spawn, but the, , (or  in the ) or  should definitely be used if obtained.
 * An or  is great at attacking him from a distance. The  and  are similar options.
 * The, obtained in the Underground Desert, is another early projectile weapon that works well.
 * The is also helpful. If the player is willing to adventure into the Underground Jungle, the  is a great choice.
 * Rangers should bring a or . A or  can also be used, if the player already defeated Eye of Cthulhu or was lucky to find  or and mine it with a,  or any other pickaxe with over 50% Pickaxe power.
 * or are the preferred ammo type, due to the high single target damage of the former and the piercing effect of the latter.
 * The is another strong ranged weapon.
 * All guns are very effective against King Slime, although they require breaking a Shadow Orb or Crimson Heart.
 * Sticky grenades do the most damage in pre-hardmode, so they are a good choice, but they do not stick to bosses
 * Magic users should bring at least . The staff, or  are the best staves available.
 * The Crimson Rod can be helpful in this fight, if at least one Crimson Heart has been broken. Though extremely rare, the Gray Zapinator is incredibly powerful.
 * Summoners should bring either a, a Flinx Staff or a , and a if affordable.
 * The  is a more powerful alternative. However, getting it requires Underground Jungle materials.
 * , although hard to obtain, is a decent choice if there are no other summon weapons available.
 * Thrower should bring a bunch of or .  can deal a lot of damage, although they may damage the player if used recklessly.
 * If has been defeated,  should be crafted, as they are very powerful throwing weapons.

Accessories
Like weapons, most accessories can help, but accessories obtained in chests are usually enough to defeat King Slime.
 * ,, , or a  can assist with avoiding damage or running away in bad situations. These can be combined into , and if possible, with a Tinkerer's Workshop, which requires a Goblin Army to be defeated.
 * If the Player has Sailfish Boots and Frog Leg, it should be combined into, which greatly increases vertical mobility.
 * The is also a very good accessory since its ability to hover can make the King Slime unable to reach the player.
 * Any double jump accessories such as the greatly increases vertical mobility. Said accessories can also be combined with a to provide further jump boosts and if possible,  to greatly increase vertical mobility.
 * The jump boost stacks with and Spectre or Amphibian Boots,
 * A boosts health regeneration, increasing survivability.
 * , although requiring to smash Corrupt Orbs or Crimson Hearts and a Tinkerer's Workshop, is a powerful accessory for mages.
 * It can further be upgraded to if the Traveling Merchant sells the Celestial Magnet.

Potions

 * and greatly increase survivability.
 * Any food that grants the or better should be used.
 * increase mobility.
 * increase the effectiveness of bows.

No teleports 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 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 summon king slime-and put bumpers on the end, King slime will have a hard time trying to teleport to the player because the player is moving super fast.

Lava pit Strategy
Because the King Slime can be harmed by Lava, a good strategy is to use a to 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 use a grappling hook to move between platforms. Just be careful to not jump in the lava if the player don't plan to use. 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 the slime, or use to fly over.

Minecart Strategy
Another strategy is to make something that could help the player later, a long Minecart rail path. If the player build it just high enough, he will not be able to teleport or jump on the player. His attacks rely on the player being on the ground. To the AI, it seems that the player are on the ground, so he just sits under the player and occasionally jumps, making him an easy target.

Death Box Strategy
In, 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, , or a thin layer of lava.

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