Guide:King Slime strategies
| This is a Guide page. This means the page will walk you through a specific task, strategy, or enemy/boss fight. This guide was last updated for version 2.0.4.006. This guide is not updated for the current version of the mod. Some or all of its advice may not be applicable to the current patch. |
Map icon
| Type | Boss – Slime |
|---|---|
| Environment | Surface – Slime Rain |
| Damage |  40 / 64  / 96  (Contact)40  / 60  (Ruby Bolt)72 (Emerald Charge) |
| Max Life | 2000 / 2800 / 4200 / 3570 / 5355 |
| Defense | 10 |
| KB Resist | 100% |
| Immune to |    |
Cold  | - |
|---|---|
Water  | - |
Sickness  | Resistant |
Electricity  | - |
Heat  | Vulnerable |
| Coins | 1  |
|---|
- Item (Quantity)Rate
Gel (72-100)100%- 100%
- 25% / 33.33%
- 25%
- 25% / 33.33%
- 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
- 33.33%
- 66.67%
Lesser Healing Potion (5-15)100%- 10%
- 14.29%
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% - 1%
- For a Normal and Expert Mode guide to King Slime, see King Slime strategies on the vanilla wiki.
King Slime is a Pre-Hardmode boss. He is intended to be one of the first few bosses fought by the player and is considered the weakest of all bosses. Fighting him is optional and not required for game progression, but his defeat may reward the player with money and useful items.
This guide will mention items exclusive to Expert and Revengeance Mode with no special formatting and will follow the intended progression.
Arena Preparation
A single, long platform at least 20 blocks off the ground is sufficient for the King Slime fight. Adding more layers of platforms can help if the player is struggling to avoid all the slimes. Smoothing the terrain at the bottom may prove helpful, but is not a necessity. Finally, a roof of solid blocks may be utilized to block ruby bolts, though this may prove more of a hindrance than a help if the player does not know how to maneuver around it.
It is usually beneficial to build an arena for King Slime in a Desert biome, as then it can be reused for the Desert Scourge.
Buff Items
- Campfires and Heart Lanterns increase health regeneration.
- Sunflowers increase movement speed.
- A Star in a Bottle increases mana regeneration, being useful for the mage class.
Gearing Up
- For on-tier, reliable equipment, see Class setups.
The Fight
General Tips
- Killing everything as the boss releases it will handily trivialize the fight.
- Dropping King Slime down to a lower layer is a good way to manage slime spawns.
- As King Slime teleports in front of where the player is moving, it is possible to get it to repeatedly teleport behind the player if they move backwards for a split second as King Slime is teleporting.
- A relatively safe window for true melee players to attack is presented when King Slime teleports.
Attacks
- King Slime will jump toward the player. After a number of jumps, or if the player is too far, King Slime will perform a large leap and begin the animation to teleport to a spot in front of the player, so they must be prepared to turn around.
- The boss regularly summons Blue Slimes when struck. Killing the slimes as they spawn is an effective counter.
In Expert Mode
- King Slime will spawn Spiked Slimes alongside the normal ones. The player should avoid standing underneath or getting near them.
In Revengeance Mode
- The slimes released as King Slime's health lowers become proportionally stronger, making it more important to choose to either kill or avoid them.
- Upon reaching 50% health, King Slime will summon the
Ruby Jewel. The jewel attempts to hover above the player and will pursue them, firing 1 / 4 
ruby bolts every 1 / 1.25 seconds. The ruby bolts can be easily avoided by moving horizontally, and as the jewel has low health, it can be easily killed.
In Revengeance Master Mode
- King Slime now only releases its two most dangerous slime variants - Spiked Ice Slimes and Spiked Jungle Slimes. The Chilled debuff especially, now widely inflicted, can be very detrimental to the player, so avoiding Spiked Ice Slimes is very important.
- Upon reaching 70% health, King Slime will summon the
Emerald Jewel. The jewel will perform predictive charges at the player every 1.5 / 0.67 seconds; last-second movements such as jumping, dashing, falling, or similar will throw off the predictive charge and allow you to dodge the jewel. The Emerald Jewel has much more health than the other two, but killing it will make the fight significantly easier. - Upon reaching 30% health, King Slime will summon the
Sapphire Jewel The jewel increases King Slime's contact damage by 1.5x and defense by 2x while it is alive. The Sapphire Jewel may not be inherently threatening, but as King Slime gets significantly faster and smaller near the end of the fight, killing it can prevent an untimely demise at the end of the fight.
