Bebilith

Demonbane Posion.  Against fiends, the Bebilith's poison damage is treated as acid damage.

Innate Spellcasting. The Bebilith's innate spellcasting ability is Wisdom (spell save DC 13). The Bebilith can innately cast the following spells, requiring no material components.
Once a day: plane shift (Self Only)

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

Magic Weapons. The Bebilith's weapons are considered magical.

Spider Climb. The Bebilith can climb difficult surfaces including upside down on ceiliings, without making an ability check.

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 ignore movement restrictions caused by webbing.

Multiattack. The Bebilith makes three attacks; two with its rending claws and one with its bite.

Rending Claws. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 5) slashing damage and if the target is wearing armor or carrying a shield, it takes a perminate and culmulative -1 penality to the AC it offers. Armor that reaches 10 and shields that reach 0 are destroyed.

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 5) piercing damage, if the target is a creature it must succeed a DC 15 Constitution saving throw or take 24 (4d10) poison damage.

Venomous Web. RangedWeapon Attack: +9 to hit, range 30/60 ft., one target. Hit: 50 (10d8) poison damage and the target is restrained by the webbing. While restrained, the target takes 10 (2d8) poison damage at the start of its turn. As an action, the restrained target can make a DC 15 Strength check to break free. The web can also be attacked and destroyed, AC 10, HP 20, the web is immune to bludgeoning, poison and psychic damage.