Bebilith (Arachnid Demon)

Magic Resistance. The bebilith has advantage on saving throws against spells and other magical effects.

Spider Climb. The bebilith can climb difficult surfaces, including upside down, without needing to make an ability check and ignores any movement restrictions caused by webbing.

Web Sense. While in contact with a web, the bebilith knows the exact location of any other creature in contact with the same web.

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

Multiattack. The bebilith makes one Bite attack and two Foreleg attacks. It can replace its Bite attack with a use of Poisoned Web (if available).

Bite. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 19 (3d10 + 3) piercing damage, plus 21 (6d6) poison damage. If the poison damage reduces the target to 0 hit points, the target lights on fire and takes 7 (2d6) fire damage at the start of each of its turns until healing is applied to them.

Foreleg. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 16 (3d8 + 3) slashing damage.

Poisoned Web (Recharge 5-6). Ranged Weapon Attack: +10 to hit, range 30/60 ft., one creature. Hit: 36 (8d8) poison damage, and the target is restrained by webbing. While restrained, the target takes 9 (2d8) poison damage at the start of each of its turns. As an action, the restrained target can make a DC 17 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 15; hp 30; immunity to bludgeoning, fire, poison, and psychic damage). Unlike normal webs, fire cannot burn a bebilith's webbing but if used will ignite the web inflicting an additional 3 (1d6) fire damage to trapped targets.

Spellcasting. The bebilith casts one of the following spells, requiring no material components and using Wisdom as the spellcasting ability:

3/day: darkness

Relentless Hunter. Immediately after dealing damage to a creature with a melee attack, the bebilith marks the creature. Only one creature can be marked at a time. The bebilith always knows the exact location of the marked creature on the current plane of existence, cannot be surprised by it, and has advantage on all attack rolls against it.