King Slime
Map icon
| Type | Boss – Slime |
|---|---|
| Environment | Surface – Slime Rain |
| Damage | Contact: 40 / 64  / 80  / 88  / 96  |
| Max Life | 2000 / 2800 / 3570 |
| Defense | 10 |
| KB Resist | 100% |
| Immune to |   |
| Coins | 5  |
|---|
- Item (Quantity)Rate
- 100%
Gel (72-100)100%- 100%
- 1 / 2 of the following 3 items will be dropped
- 33.33% / 66.67%
- 33.33% / 66.67%
- 33.33% / 66.67%
- One of the following 2 items will be dropped
- 66.67%
- 33.33%
- 25%
- 10%
Lesser Healing Potion (5-15)100%- 10%
- 14.29%
- 1%
King Slime (Lore)(Always on first kill)100%
Treasure Bag(King Slime)100%
Royal Delight(In Master or Revengeance Mode only)25% / 25% 
King Slime Relic(In Master or Revengeance Mode only)100% / 100%
- If you were looking for King Slime on the vanilla wiki, click here.
"Given time, these gelatinous creatures absorb each other and slowly grow in both size and strength."
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 
Crown Jewel. The jewel hovers above the player and pursues them, firing 1 / 3 
Jewel Bolts every 1.25 / 1 seconds until the end of the fight.
In Death Mode
- The Crown 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.
On the For the worthy seed
- Health increased to 3000 / 4200 / 5355 .
- King Slime's scale is set to 3x / 6x .
Summons
| Image | Name | Condition |
|---|---|---|
 |
Crown Jewel | Always at 50% health in Revengeance Mode |
 |
Blue Slime | Always |
 |
Green Slime | Always in Revengeance Mode |
 |
Ice Slime | Always in Revengeance Mode |
 |
Pinky | Always |
 |
Purple Slime | Always in Revengeance Mode |
 |
Rainbow Slime | During the Rain or Boss Rush while in Hardmode |
 |
Red Slime | Always in Revengeance Mode |
 |
Spiked Slime | Always |
 |
Umbrella Slime | During the Rain or Boss Rush |
 |
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 you, 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 trarverse the terrain and deal with the multitude of minions the boss spawns.
History
- 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%.
- 1.5.1.003: Now drops 5 .
- 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 to 300,000 / 420,000 .
- Changed Gel drop amount from 60-80 / 90-120 to 72-100.
- Gel drops are now compacted into stacks of 4.
- Nerfed Boss Rush health from 3,000,000 / 4,200,000
- 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 / 80 / 92 to 40 / 64 / 76 / 84 .
- Nerfed Spiked Slime contact damage from 28 / 56 / 70 / 80 to 28 / 56 / 67 / 73 .
- Death Mode now causes it to behave in final phase immediately instead of below 10% health.
- Nerfed damage from 40 / 64
- 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.
- Reworked Revengeance Mode AI:
- 1.4.2.104: Decreased teleport frequency in Revengeance and Death Mode.
- 1.4.2.103: Fixed it only dropping Gel on first kill.
- 1.4.2.102: Now drops Gel.
- 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.
- 1.4.1.003: No longer disables Hooks.
- 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 to 1.85x .
- No longer has 10% damage reduction.
- Buffed Death Mode health modifier from 1.75x
- 1.3.4.001: Nerfed health modifier from 1.7x / 2.9x to 1.75x .
- 1.3.0.001: Can now drop Crown Jewel in Revengeance Mode.
- 1.2.4.101: Buffed Death Mode health modifier from 1.8x to 2.9x .
- 1.2.4.002: Buffed Revengeance Mode health modifier from 1.4x to 1.7x .
- 1.2.3.002:
- Now gains a 1.8x health modifier in Death Mode.
- Now faster and teleports more often in Death Mode.
- Now gains a 1.8x
- 1.2.0.001:
- Now gains a 1.4x health modifier in Revengeance Mode.
- Now generally more aggressive.
- Now has a 2% chance to drop Laudanum or Stress Pills in Revengeance Mode.
- Now gains a 1.4x
