The Elements and Beyond p.208
Death Burst: When the spider dies, it explodes in a burst of fiery blood and ooze. Each creature within 5 feet of it must make a DC 13 Dexterity saving throw, taking 7 (2d6) fire damage on a failed save, or half as much damage on a successful one. Flammable objects thataren't being worn or carried in that area are ignited.
Heated Carapace: At the start of each of the spider's turns, it deals 3 (1d6) fire damage to each creature grappling it and each creature or object it is grappling or it is climbing on. A creature that touches the spider or hits it with a melee attack while within 5 feet of it takes 3 (1d6) fire damage.
Spider Climb: The spider can climb difficult surfaces, including upside down on ceilings, without needing tomake an ability check.
Stiffen: If the spider takes cold damage, its heated body stiffens in response, and its speed is reduced to 15 feet until the end of its next turn.
Volcanic Web Walker: The spider ignores movement restrictions caused by webbing, lava, or magma.
Web Sense: While in contact with a web, the spider knows the exact location of any other creature in contact with the same web.
Bite: Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 7 (1d4 + 5) piercing damage plus 3 (1d6) fire damage, and the target must make a DC 13 Constitution saving throw. On a failed save, the target takes 7 (2d6) fire damage and 9(2d8) poison damage and it ignites. Until a creature takes an action to douse the fire, the target takes 5 (1d10) fire damage at the start of each of its turns. On a success, the target takes half damage and doesn't ignite. If the damage from the save reduces the target to O hit points, the target is stable but poisoned for 1 hour, even after regaining hit points,and is paralyzed while poisoned in this way.
Volcanoes and Elemental Planes
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