Eldritch Understanding. Yx'Larak can read and use any spell scroll or magic item, ignoring all class, race, and level requirements.

Poisonous Blood. A creature that hits the spider of Leng with a melee attack while within 5 feet of it takes 9 (2d8) poison damage.

Poisonous Death. When Yx'Larakdies, the poisonous blood in its body vaporizes, forming a cloud in the spider’s space until initiative count 20 on the next round. Each creature within 5 feet of the spider and each creature that enters the cloud for the first time on a turn must make a DC 16 Constitution saving throw, taking 18 (4d8) poison damage on a failed save, or half as much damage on a successful one.

Multiattack. Yx'Larak makes two Claw attacks and one Staff of Leng attack, or it makes three Spit Venom attacks.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) slashing damage plus 4 (1d8) poison damage.

Staff of Leng. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 3) bludgeoning damage plus 7 (2d6) psychic damage, and the target must succeed on a DC 15 Wisdom saving throw or be stunned until the end of is next turn.

Spit Venom. Ranged Weapon Attack: +8 to hit, range 20/60 ft., one target. Hit: 16 (3d8 + 3) poison damage, and the target must succeed on a DC 15 Constitution saving throw or be poisoned and blinded until the end of its next turn.

Spellcasting. The spider of Leng casts one of the following spells, requiring no material components and using Intelligence as the spellcasting ability (spell save DC 16):

At will: comprehend languages, detect magic, eldritch blast
3/day each: confusion, silence
1/day each: arcane eye, hypnotic pattern

Web. Dexterity Saving Throw:[[/save dex 13 format=long]]{ DC 13}, one creature the spider can see within 60 feet. Failure: The target has the &Reference[restrained]{Restrained} condition until the web is destroyed (AC 10; HP 5; Vulnerability to &Reference[fire]{Fire} damage; Immunity to &Reference[poison]{Poison} and &Reference[psychic]{Psychic} damage).

Poisonous Riposte. Yx'Larak adds 3 to its AC against one melee attack that would hit it. To do so, the spider must see the attacker. If this effect causes the attack to miss, the attacker takes 4 (1d8) poison damage.