Sculksaur

The Warden's nightmare.

OverworldBoss

At a glance

You cannot tame the Sculksaur. It is a boss, and it only shows up once a Warden has.

Wake a Warden in an Ancient City. Within two minutes the Sculksaur arrives and eats it.
Stay quiet while it lurks. It listens like a Warden, so sneak and stay on wool. Get within 15 blocks and it roars and charges.
Shoot the 6 warts on its back with arrows. Each one you destroy drops 1 to 2 Sculk Toxin and takes away some of its armour. A sword barely scratches it until the warts are gone.
Craft Sculk Tipped Arrows from the toxin and a Sculk Bow.
With the warts gone, melee works and those arrows hit 5 times as hard. Finish it.

Wart shell. With all 6 warts on it takes only 10% on Java, 5% on Bedrock of a hit. Every wart you shoot off lets more through, and with none left it takes full damage.
How it can die. Any damage can kill it, but its wart shell scales hits down. On Bedrock, Sculk Toxin arrows go straight through the shell.
Darkness. On Bedrock its bites, tail and explosion leave you in Darkness, and its roar darkens every player within 25 blocks for 15 seconds.
Hearing. It is blind and hunts by sound within 16 blocks on Java, 30 blocks on Bedrock, like the Warden. Sneak, and stay on wool.
Warden rivalry. It hits Wardens for 5 times damage and wins.
It bites, whips you with its tail, and sets off an explosion when it cannot reach you. While it charges it breaks the blocks in its way, so walls will not save you.
It never despawns. Once it is awake it stays, and after you beat it there is a 15 minutes wait before another can turn up.