Bone Spider

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

Web Walker. The bone spider ignores movement restrictions caused by webbing.

Pack Tactics. The bone spider has an advantage on an attack role against a creature if at least one of the bone spider's allies is within 5 feet of the creature and the ally isn't incapacitated.

Bone Bite. Melee Weapon Attack: The Bone Spider Lashes out with it's boney mandibles at one target dealing 2d8 +1 damage to the target and if hit they will have to make a Strength saving throw of 8 ot higher and if they fail their movement speed will be cut in half if they are succussful with their saving throw their movement speed will be reduced by one 3rd.

Bone Slash. Melee Weapon Attack: The Bone Spider Lashes out with it's two front legs at two targets if it lands a hit there will be 2d8 damage dealt to the target.

Bone Shard.  Ranged Weapon Attack, Rang/Area 60ft (10ft cone): The Bone Spider fires off a cone of 16 bone shards from it's mouth at the party each one will deal 5d8 +1 damage to the target if hit they will then have to make a Strength saving throw of 13 or higher if they fail their movement speed will be reduced by two 3rds if they are successful with the saving throw their movement speed  is reduced by one 3rd.