Yarnspinner

Huge fey (archfey), Lawful Good

Armor Class 16 (natural armor)

Hit Points 138 (12d12 + 60)

Speed 40 ft., climb 40 ft.

STR 24 (+7)

DEX 16 (+3)

CON 21 (+5)

INT 18 (+4)

WIS 21 (+5)

CHA 19 (+4)

Saving Throws CON +9, WIS +9, CHA +8

Skills Perception +13, Stealth +7

Condition Immunities charmed, frightened

Senses truesight 120 ft., passive Perception 23

Languages Common, Druidic, Sylvan

Challenge 10

Fey Rebirth. If Yarnspinner dies in his Domain of Delight, he revives with all his hit points 1d4 days later in a safe location in that domain.

Legendary Resistance (3/Day). If Yarnspinner fails a saving throw, he can choose to succeed instead.

Spider Climb. Yarnspinner can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Web Walker. Yarnspinner ignores movement restrictions caused by webbing.

Web Weaver (3/Day). Yarnspinner can take 1 minute to craft one of the following structures out of webbing:

A 3-inch-thick, opaque wall of webbing consisting of up to three 10-foot-square sections, each of which must be anchored on at least two sides by other walls or surfaces. Each section has AC 12; 20 hit points; vulnerability to fire damage; and immunity to bludgeoning, poison, and psychic damage.
A hut small enough to fit in a 10-foot cube. The hut comes with a closable door and a comfortable bed made of webbing, sized for a Tiny, Small, or Medium creature.
A message consisting of no more than twenty-five characters, anchored at various points so it hangs in the air.

Actions

Multiattack. Yarnspinner makes two Bite attacks and uses Spellcasting or Web once.

Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 17 (3d6 + 7) piercing damage plus 11 (2d10) poison damage.

Web. Yarnspinner shoots webbing at one creature he can see within 120 feet of himself. The target must succeed on a DC 17 Strength saving throw or be restrained for 1 hour. The target can repeat the save at the end of each of its turns, ending the effect on itself on a success.

Source

DoD, p. 22