Blisterbomb Spider

llumination. The spider sheds bright light in a 10-foot radius and dim light for an additional 10 feet.

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.

Blood Embers. When the spider takes damage of any kind except psychic or fire, each creature within 5 feet of it takes 9 (4d4) fire damage.

Blisterbomb. When the spider is reduced to zero hit points, it must make a DC 10 Constitution saving throw. On a successful save, the spider explodes, creating a 15-foot radius sphere cloud of thick smoke that obscures the area. On a failed save, the spider explodes, instead creating 15-foot radius sphere fireball. Each creature in that area must succeed a DC 11 Dexterity saving throw, taking 13 (4d6) fire damage and 7 (2d6) poison damage on a failed save, or half as much on a successful one.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 7 (1d8 + 3) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 9 (2d8) poison damage on a failed save, or half as much damage on a successful one. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.

Burning Web (Recharge 4–6). Ranged Weapon Attack: +5 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage). While the target is restrained, it takes 5 (2d4) fire damage at the start of each of its turns, and the webbing takes 1 damage at the start of each of its turns. When the spider successfully recharges this ability, it must make a DC 10 constitution saving throw. On a failed save, it is reduced to zero hit points and automatically fails the saving throw from its Blisterbomb trait.

Burning Web Burst. While in contact with a web, the spider can use its bonus action to detonate the entire web, regardless of how far it extends. Anything within 10 feet of any part of the web must succeed a DC 13 Dexterity saving throw or take 9 (4d4) fire damage, or half that much on a successful save.