Ker-arach

Ker-arach has advantage on saving throws against spells and other magical effects.

Ker-arach can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Ker-arach ignores movement restrictions caused by webbing.

Ker-arach makes one Bite attack and two Claw attacks.

Melee Weapon Attack +9 to hit, reach 10 ft., one target. 10 (1d10 + 5) Piercing damage plus 13 (2d12) Poison damage.

Melee Weapon Attack +9 to hit, reach 5 ft., one target. 12 (2d6 + 5) Slashing damage.

Ker-arach exhales venomous spiderlings in a 30-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, taking 33 (6d10) Piercing damage and 33 (6d10) Poison damage on a failed save or half as much damage on a successful one.

Ker-arach spins a 30-foot cube of strong, sticky webbing in an area adjacent to itself. The webbing lasts for 1 minute, is difficult terrain, and lightly obscures its area. A creature that starts its turn in the webbing or enters the webbing for the first time on its turn must succeed on a DC 15 Dexterity saving throw or have the Restrained condition while in the web. As an action, a creature can free itself or another creature from the web by succeeding on a DC 15 Strength check.
A 5-foot cube of the web is destroyed if it takes at least 10 acid, fire, or Slashing damage on a single turn.