The Spider King is a spider boss. At the lowest Threat it has 1140 health, hits for 20 and carries 4 armor; the uber version you meet in the Mortal Arena has ×1.6 the health and ×1.75 the damage. You need Spider King's Eye to call it out.

It waits at the end of The Sporeveil, in place of Imp Overlord, and belongs to Adventure Mode.

Every kill rolls its list 5 times. 8 Uniques sit on it: four ordinary ones splitting 90.0% of it between them, and four Exceptional ones splitting the last 10.0%, which puts any one of those at about 1 in 40 of what it gives up. The Exceptional ones are The Spider King's Cradle, The Spider King's Brood, Snareline and The Midnight Drop.

It opens every fight with Silk Lattice, then fights with Brood Call, Venom Rain and Web Snare. The cast bar under its health names each big move as it winds up, so a party can call them out to each other. At 55% health it changes phase: Royal Molt. After each big set piece it stops for a breath: that is the opening to punish. At 15% it makes its Last Stand with Final Weave, one named, fully telegraphed finisher, and no burst of damage skips it. The uber version in the Mortal Arena fights in three phases (Weaver, Molted and Loom Eternal), grows between them, and adds Silk Cage and Venom Deluge. Its weak spot: Smash the Eggs. Destroy every egg before it hatches and the King falls from his silk.

It calls in Sporeling.