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The King Slime is an optional boss in pre-hardmode. Unlike most bosses, this boss can't pass through blocks.

Terrain Preparation

Due to the fact this boss can't pass through blocks, there are some arena options:

  • Since 1.3 update King Slime can teleport to you at will so hiding in houses is impossible. This also makes platforms useless. Nearly all strategies below are useless in 1.3 version.
  • The player can add traps to this pit, which would make the fight even easier or:
  • A flat area with small room below it with Platforms as roof for the player. King Slime can't enter small rooms and thus can't touch the players in this room.
  • An arena made up of platforms and Ropes for both horizontal and vertical movement would help. (Effective for 1.3)

It is also recommended to close any caves near the summoning spot, since the boss might spawn inside and get stuck.

  • Or, just make a small 2*4 pit cover the top with wooden platforms and shoot upwards.
  • You can make a simple room 4x4 with wood platforms as a celing.The slimes won't go in and you can shoot at him with any Ranged weapon as them can shoot trough the platform.

Gearing Up

Armor

Lead armor/Iron armor or higher is recommended to reduce the damage of Blue Slimes summoned by it to an insignificant amount. However, this boss isn't hard without armor, if using a good arena.

Weapons

Most weapons can be used to fight this boss without difficulties, except Shortswords. Piercing weapons may be preferred, to hit both the blue slimes and the king slime himself.

However, melee users may have trouble fighting the boss due to the knockback immunity, unlike ranged users which can stay in an unreachable place without getting hit. Recommendations:

Accessories

Like weapons, most accessories can help:

Potions

The Battle

Fighting King Slime is relatively simple, it will attempt to hop to the player and summon blue slimes. Keep killing the tiny slimes as soon as possible and damage the king slime after that.

If you are cornered, try to pass through the boss to the other side of the arena by running while it is jumping at you.


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