Spider Dragon

Large dragon, chaotic evil
AC: 17 (natural armor)
HP: 178 (17d10 + 85)
Speed: 40 ft., climb 40 ft., fly 80 ft.

STR: 21 (+5)
DEX: 14 (+2)
CON: 20 (+5)
INT: 12 (+1)
WIS: 15 (+2)
CHA: 16 (+3)

Saving Throws: Dex +6, Con +9, Wis +6, Cha +7
Skills: Perception +10, Stealth +6
Damage Resistances: fire; bludgeoning, piercing, and slashing from nonmagical attacks
Senses: blindsight 60 ft., darkvision 120 ft., passive Perception 20
Languages: Common, Draconic
Challenge:10 (5,900 XP)

*Traits*

Spider Climb: The spider dragon 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 dragon knows the exact location of any other creature in contact with the same web.

Web Walker: The spider dragon ignores movement restrictions caused by webbing.

*Actions*

Multiattack: The spider dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite: Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage.
Claw: Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Frightful Presence: Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 15 Wis saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Web Breath (Recharge 5-6): The spider dragon exhales sticky webbing in a 60-foot cone. Each creature in that area must make a DC 17 Dex saving throw. On a failure, a creature is restrained by the webbing. As an action, the restrained creature can make a DC 17 Str check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 10; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage). The webbing is flammable. Any 5-foot cube of webs exposed to fire burns away in 1 round, dealing 2d4 fire damage to any creature that starts its turn in the fire.