King Slime

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King Slime
King Slime.png
Map Icon King Slime.png
Map icon
Statistics
TypeBossSlime
EnvironmentSurfaceSlime Rain
DamageContact:
This attack will cause defense damage on hit. 40 / 64 Expert Mode / 80 Revengeance Mode / 88 Death Mode / 96 Master Mode
Max Life2000 / 2800 Expert Mode / 3570 Master Mode
Defense10
KB Resist100%
Immune toConfusedPoisoned
Cold Bestiary Cold.png-
Water Bestiary Water.png-
Sickness Bestiary Sickness.pngResistant
Electricity Bestiary Electricity.png-
Heat Bestiary Heat.pngVulnerable
Drops
Coins 5 Gold Coin.png
Sounds
If you were looking for King Slime on the vanilla wiki, click here.

King Slime Trophy.png "Given time, these gelatinous creatures absorb each other and slowly grow in both size and strength." King Slime Trophy.png

King Slime is a Pre-Hardmode boss. He is intended to be one of the first bosses fought by the player and is considered to be the weakest of all of the bosses. Fighting him is completely optional and not required for game progression, but his defeat may reward the player with money and useful items.

While in Revengeance and Death Mode, King Slime gains several changes to his AI such as an additional boost to his mobility and a boss servant which attacks the player from a distance.

Spawn

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

  • Naturally (albeit very rarely) on grass at the far left or far right of the map.
  • Naturally by defeating 150 slimes during a Slime Rain.
  • Using a Slime Crown.

Behavior

King Slime can now jump through blocks to reach his target.

In Revengeance Mode

King Slime behaves similarly to a slime, performing a high leap every 4 jumps. All jumps are boosted relative to the vertical distance between the slime and the player, increasing his jump speed and height by 3.2% every block and capping at a 100% bonus. The delay between jumps will reduce when his health drops below 80%, 60%, 40%, 20%, and 10%.

Additionally, King Slime will occasionally teleport regardless of condition and at a faster rate. He will teleport more often if the player is hidden behind solid tiles or is at least 20 blocks above him. He will also teleport closer to the player, and will always teleport in front of them, as well as gaining the ability to teleport mid-air if the player is high above the ground.

When 5% of his health is lost, the next hit from the player will spawn 2-3 slimes from King Slime. The following slimes can drop from the boss:

Spiked Slimes are twice as likely to be dropped. During the rain, Umbrella Slimes have a 10% chance to replace any of the above slimes. Umbrella Slimes have a 20% chance to be replaced with a Rainbow Slime while in Hardmode. Pinky can also replace the other slimes with a 1% chance.

When King Slime drops to 75% of his health, he jumps farther, and Spiked Slimes become four times as likely to be dropped compared to the other slimes.

When King Slime drops to 50% of his health, he summons a Ruby JewelRuby Jewel. The jewel hovers above the player and pursues them, firing 1 Revengeance Mode / 3 Death Mode Jewel BoltJewel Bolts every 1.25 Revengeance Mode / 1 Death Mode seconds until the end of the fight.

In Death Mode

  • The Ruby Jewel shoots a spread of three bolts and fires 20% faster.
  • King Slime is three times as large.
  • King Slime jumps farther and falls faster.
  • King Slime takes half as much time to teleport if the player is hidden behind solid tiles or is at least 20 blocks above him.
  • All Blue, Green, Ice, Purple, Red, and Yellow Slimes are replaced with Spiked Slimes.

In Master Mode

  • King Slime has increased fall speed.
  • King Slime's threshold for teleporting is halved and teleports faster.
  • King Slime has faster horizontal acceleration.
  • King Slime has increased jump speed.
  • Chance to spawn Spiked Slimes is doubled.

In Revengeance Master Mode

In Death Master Mode

  • Emerald Jewel dashes faster and more frequently.

On the For the worthy seed

  • Health increased to 3000 / 4200 Expert Mode / 5355 Master Mode.
  • King Slime's scale is set to 3x / 6x Death Mode.

Summons

Enemy Condition
Ruby Jewel Ruby Jewel Always at 50% health in Revengeance Mode
Sapphire Jewel Sapphire Jewel Always at 50% health in Revengeance Master Mode
Emerald Jewel Emerald Jewel Always at 50% health in Revengeance Master Mode
Blue Slime Blue Slime Always
Green Slime Green Slime Always in Revengeance Mode
Ice Slime Ice Slime Always in Revengeance Mode
Pinky Pinky Always
Purple Slime Purple Slime Always in Revengeance Mode
Rainbow Slime Rainbow Slime During the rain or Boss Rush while in Hardmode
Red Slime Red Slime Always in Revengeance Mode
Spiked Slime Spiked Slime Always
Umbrella Slime Umbrella Slime During the rain or Boss Rush
Yellow Slime Yellow Slime Always in Revengeance Mode

Tips

For more elaborate strategies on defeating King Slime, including weapon and arena recommendations, see Guide:King Slime strategies.
  • Simply making a large flat area and running in one direction with at least Hermes Boots or better can trivialize this boss, even on the hardest difficulties.
    • This is less true in Revengeance and Death Mode, however, due to the smart teleporting King Slime gains, where he will always try to move ahead of the player, having at least one set of platforms in this scenario is probably necessary.
  • Having at least a Cloud in a Bottle and decent crowd control, such as a gem staff, makes it much easier to handle the boss even with a lackluster or no arena. It allows the player to both easily traverse the terrain and deal with the multitude of minions the boss spawns.

History

These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • 2.0.4.002: Buffed contact damage in Master Mode from 120 Master Mode to 144 Master Mode.
  • 2.0.4.001:
    • Buffed health from 2000 / 2800 Expert Mode / 3570 Master Mode to 2000 / 2800 Expert Mode / 4200 Revengeance Mode / 3570 Master Mode / 5355 Revengeance Mode Master Mode.
    • Increased health multiplier in the For the worthy seed from 1.5x to 1.8x.
    • Buffed contact damage from 40 / 64 Expert Mode / 80 Revengeance Mode / 88 Death Mode / 96 Master Mode to 40 / 64 Expert Mode / 80 Revengeance Mode / 96 Death Mode / 120 Master Mode.
    • No longer uses a global scaling contact damage formula based on boss velocity.
    • No longer becomes immune to damage while teleporting.
    • No longer deals contact damage while not jumping in all difficulties.
    • Revengeance Mode changes:
      • Increased teleport distance, and he now has a 0.25 second delay before jumping after a teleport.
      • Changed slime spawning to spawn progressively stronger slimes later in the fight, and can now spawn Spiked Ice Slimes and Spiked Jungle Slimes at low health.
      • Can now rarely spawn Rainbow Slimes during the rain in Hardmode.
      • Now teleports faster and has a higher jump and fall velocity if the Ruby Jewel is defeated.
    • Now constantly does fast, short hops when below 30% health and has a smaller minimum size in Death Mode.
    • Now has increased jump and fall velocity and decelerates slower when landing from a jump in Master Mode.
    • Now gains increased horizontal speed on jumps, triggers its teleport sooner, only spawns Spiked Ice Slimes and Spiked Jungles Slimes, and additionally spawns a Sapphire Jewel that buffs damage and defense and an Emerald Jewel that charges predictively at the player in Revengeance Master Mode.
    • Now starts off small and gets bigger at lower health in the For the worthy seed.
  • 2.0.1.001:
    • Can now jump through tiles, and will now attempt to teleport in front of the player in Revengeance Mode.
    • Increased the chance to spawn Pinky as it takes damage on Revengeance and Death Mode from 0.4% to 1%.
  • 1.5.1.001:
    • It and Spiked Slimes are now vulnerable to heat debuffs, but resistant to sickness debuffs.
    • Now drops Royal Gel regardless of world difficulty.
  • 1.5.0.002: Hearts can now drop from its boss servants.
  • 1.5.0.001:
    • Nerfed Boss Rush health from 3,000,000 / 4,200,000 Expert Mode to 300,000 / 420,000 Expert Mode.
    • Changed Gel drop amount from 60-80 / 90-120 Expert Mode to 72-100.
    • Gel drops are now compacted into stacks of 4.
  • 1.4.5.003: Now moves faster, only spawns Spiked Slimes, no longer summons its Crown Jewel at the start of the fight, and is much larger in Death Mode.
  • 1.4.3.001:
    • Nerfed damage from 40 / 64 Expert Mode / 80 Revengeance Mode / 92 Death Mode to 40 / 64 Expert Mode / 76 Revengeance Mode / 84 Death Mode.
    • Nerfed Spiked Slime contact damage from 28 / 56 Expert Mode / 70 Revengeance Mode / 80 Death Mode to 28 / 56 Expert Mode / 67 Revengeance Mode / 73 Death Mode.
    • Death Mode now causes it to behave in final phase immediately instead of below 10% health.
  • 1.4.2.108: Can now only spawn Rainbow Slimes during Hardmode in Revengeance Mode.
  • 1.4.2.106:
    • Buffed Boss Rush health from 500,000 to 3,000,000.
    • Buffed Blue Slime Boss Rush health from 12,000 to 36,000.
    • Buffed Spiked Slime Boss Rush health from 24,000 to 72,000.
    • All slimes now have increased health during Boss Rush.
  • 1.4.2.105:
    • Reworked Revengeance Mode AI:
      • Now jumps higher and moves faster the higher his targeted player is.
      • When below 50% health, spawns a Crown Jewel which follows the player and fires ruby magic bolts.
      • Can now spawn all kinds of slimes when damaged.
  • 1.4.2.104: Decreased teleport frequency in Revengeance and Death Mode.
  • 1.4.2.103: Fixed it only dropping Gel on first kill.
  • 1.4.2.001:
    • Nerfed Boss Rush health from 1,000,000 to 500,000.
    • Nerfed Blue Slime Boss Rush health from 24,000 to 12,000.
    • Nerfed Spiked Slime Boss Rush health from 48,000 to 24,000.
  • 1.4.1.001:
    • Buffed Boss Rush health from 500,000 to 1,000,000.
    • Buffed Blue Slime Boss Rush health from 12,000 to 24,000.
    • Buffed Spiked Slime Boss Rush health from 24,000 to 48,000.
    • Buffed Boss Rush damage modifier from 3x to 4x.
    • Now disables Hooks.
  • 1.4.0.001: Lowered aggressiveness in Revengeance Mode.
  • 1.3.4.101:
    • Buffed Death Mode health modifier from 1.75x Death Mode to 1.85x Death Mode.
    • No longer has 10% damage reduction.
  • 1.3.4.001: Nerfed health modifier from 1.7x Revengeance Mode / 2.9x Death Mode to 1.75x Death Mode.
  • 1.3.0.001: Can now drop Crown Jewel in Revengeance Mode.
  • 1.2.4.101: Buffed Death Mode health modifier from 1.8x Death Mode to 2.9x Death Mode.
  • 1.2.4.002: Buffed Revengeance Mode health modifier from 1.4x Revengeance Mode to 1.7x Revengeance Mode.
  • 1.2.3.002:
    • Now gains a 1.8x Death Mode health modifier in Death Mode.
    • Now faster and teleports more often in Death Mode.
  • 1.2.0.001:
    • Now gains a 1.4x Revengeance Mode health modifier in Revengeance Mode.
    • Now generally more aggressive.
    • Now has a 2% Revengeance Mode chance to drop Laudanum or Stress Pills in Revengeance Mode.