King Slime Terraria boss · Pre-Hardmode · #1 in the usual order

A huge blue slime wearing a jeweled crown, with a ninja trapped inside. He is often the first boss a new player meets. Beating him is not needed for progress, but he drops handy early gear and money.

Stage: Pre-Hardmode
Required?: Optional
Summon: Slime Crown
Where: Anywhere, any time (natural spawns: outer edges of the world, daytime)
Max life: 2,000 (Classic)
Defense: 10

Biome: Forest

Stats by difficulty

Stat	Classic	Expert	Master
Max life	2,000	2,800	3,570
Contact damage	40	64	96

How to summon King Slime

Slime Crown. Use a Slime Crown anywhere at any time. Craft it from 20 Gel and a Gold or Platinum Crown at a Demon or Crimson Altar. He also appears after you kill 150 slimes during a Slime Rain (75 once he has been beaten), and very rarely on grass near the world edges in daytime.

Attacks and phases

Hops around, with occasional very high jumps that try to land on you.
Teleports next to you if you get too far away or he gets stuck.
Spits out Blue Slimes as he takes damage, and slowly shrinks. Expert adds Spiked Slimes that shoot spikes.

Strategy

Fight on flat open ground and build a long platform or two above it.
Keep moving sideways and jump over him as he lands.
Piercing weapons hit both him and his small slimes at once.
His little slimes drop Hearts, so kill a few when you need healing.
Watch for the teleport: he vanishes and reappears close to you, so stay ready to move.
Iron or better armor and a few Lesser Healing Potions are plenty.

Recommended weapons

Melee

Gold or Platinum Broadsword

Ranged

Gold or Platinum Bow with Flaming Arrows

Magic

Wand of Sparking or an Amethyst Staff

Summoner

Finch Staff

Armor and gear for each stage.

Drops

Item	Qty	Chance
Slimy Saddle	1	25%
One of the following 3 items will be dropped
Ninja Hood	1	33.33%
Ninja Shirt	1	33.33%
Ninja Pants	1	33.33%
One of the following 2 items will be dropped
Slime Hook	1	33.33%
Slime Gun	1	66.67%
Lesser Healing Potion	5-15	100%
King Slime Mask	1	14.29%
King Slime Trophy	1	10%

Expert and Master Mode extras

Royal Gel Expert · 100%

Solidifier Expert · 100%

Royal Delight Master · 25%

King Slime Relic Master · 100%

Classic Mode rates. In Expert and Master Mode most loot comes in a treasure bag , which also holds the Expert-only Royal Gel.

After you beat King Slime

Ninja armor, the Slime Hook or the Slime Gun, and the Slimy Saddle mount
The Nerdy Slime town slime can move in
Later Slime Rains need only 75 slime kills to summon him

Did you know? According to the developer, the ninja trapped inside King Slime is the Guide's brother.

FAQ

How do you summon King Slime in Terraria?

Use a Slime Crown anywhere at any time. Craft it from 20 Gel and a Gold or Platinum Crown at a Demon or Crimson Altar. He also appears after you kill 150 slimes during a Slime Rain (75 once he has been beaten), and very rarely on grass near the world edges in daytime.

How much health does King Slime have?

2,000 in Classic, 2,800 in Expert and 3,570 in Master Mode.

What does King Slime drop?

Slimy Saddle, Ninja Hood, Ninja Shirt, Ninja Pants, Slime Hook, Slime Gun, plus the Royal Gel from the Expert Mode treasure bag.

What should I use against King Slime?

Melee: Gold or Platinum Broadsword. Ranged: Gold or Platinum Bow with Flaming Arrows. Magic: Wand of Sparking or an Amethyst Staff. Summoner: Finch Staff.

Sources & picture credits

Guide text is original retrogameindex writing, checked against the Terraria Wiki. Boss statistics and drop rates are the game values shown in the Terraria Wiki’s infoboxes. Sprites and artwork © Re-Logic; local copies archived from Terraria Wiki file pages (listed on the image gallery).