Eleusis, Caverns of Danger, 10. Spider King's Lair

This 40 foot triangular room has high sweeping ceilings, with walls and ceilings covered in thick webs.

There is a single entrance to the north.

The webs muffle sound within the room.

The northern half of the cave is home to a spider king and five female giant redback spiders (See Below). The spiders crawl amid thick webs that fill the top 10 feet beneath the 30-foot-high ceiling.  

Female Giant Redback Spider

Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.   Web Sense. While in contact with a web, the spider knows the exact location of any other creature in contact with the same web.   Web Walker. The spider ignores movement restrictions caused by webbing.  

Actions

  Neurotoxic Fangs. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1 piercing damage, and the target's Constitution score is reduced by 1d4 to a minimum of 1. If the target has 1 Constitution, it is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way. Constitution reduction lasts until the target finishes a short or long rest.   Spinnerets (Recharge 5-6). Each creature in a 60 by 5 foot line originating from the spider must succeed on a DC 13 Strength saving throw or its Strength and Dexterity scores are reduced by 1d4 to a minimum of 1. If the target has 1 Strength or Dexterity, it is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way. These reductions last until the affected creatures finish a short or long rest.

Five hobgoblins have been cocooned and anchored to the south ceiling. One remains alive, but has a strength of 1.