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

Web Walker. The Acromantula ignores movement restrictions caused by webbing.

Multiattack. The Acromantula makes two attacks: one with its bite and one with its web.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 3) piercing damage, and the target must make a DC 13 Constitution saving throw or take 10 (3d6) poison damage. On a successful save, the target takes half the poison damage.

Web (Recharge 5-6). The Acromantula can cast a web in a 30-foot cone. Each creature in that area must make a DC 13 Strength saving throw or be restrained by webbing. A creature can use its action to make a DC 13 Strength check, freeing itself or another creature within its reach on a success. The webbing has AC 10, 15 hit points, resistance to bludgeoning and piercing damage, and immunity to poison and psychic damage.