Spider King

"The king... no, the mastermind!"

The Spider King is a boss that spawns from Spider Hordes. If the world is over 65 Days old, the Spider King is eligible to spawn shortly after the last Siege Spider in a wave spawns. Visually he resembles a giant, red Spider Queen with tusks and larger eyes.

Fighting
The King will attack three times and then summon several poison bombs around himself, after which he will ground pound. When he reaches 1,000 health, he will do three ground pounds in quick-succession, signifying that he is weakened. Three days after spawning, the king will despawn if not killed.

The gear you'll need to kill the king depends on what strategy you're employing. If you're kiting, a walking cane, a high damage weapon, and whatever armor you see as fit is enough to take the boss down. It is recommended to bring high-absorption armor due to the king's 150 attack damage. The thulecite crown's ability is especially helpful due to the king's poison bombs.

Kiting is generally the best method to kill the Spider King due to his unmatched damage output & high health. Getting in two hits between attacks is best due to his high range. After the third attack you can get in 3-4 hits while the king is getting ready to spew poison bombs. Getting caught in one of the poison bombs usually spells disaster as you'll get stuck, meaning you'll be punished with a ground-pound attack.

Tanking the king is possible but quite inefficient and punishing so it is only recommended as high damage characters such as Wolfgang. A couple marble suits and whatever helmet(s) you chose to cut the damage with should be enough if you're using a high-damage weapon.