Bone Horse

Multiattack- The bone horse makes two Hoof attacks. If the Bone Horse has grappled a creature it can forfeit one of these attacks to use Bone Theft 

Hooves. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 11 (3d6 + 4) bludgeoning damage.

Bone theft- Bone Horse tears at the limb of a grappled creature the creature must make a dc 15 str or dex save on a success they take half damage. 4d6+4 slashing 2d4 necrotic 

Grapple- +9 to hit

Bone Fling- The Bone Horse flings a Bone at an enemy the creature must make a dc 15 con save or be stunned until the end of their next turn. 

Bone grab- The Bone Horse attempts to grab a creatures limb, The Bone Horse can grapple a creature. 

Bone slide- The Bone Horse turns into a pile of bones and disengages moving up to half it's speed  

Scatter(Recharge 1-4)- When The Bone Horse is targeted for an attack it dismantles it's self and can take halve damage on all attacks until it's next turn. 

Screech(Recharge 1-3)- When The Bone Horse is hit with an attack it can use screech any creature within 30ft of the Bone Horse must make a dc 17 wis save or be frightened until the end of the Bone Horses next turn.