Bone Reaver Centipede

Bone Cleave: The Bone Reaver Centipede Ignores all natural armor.

Freedom of Movement. The Bone Reaver Centipede ignores difficult terrain, and magical effects can't reduce its speed or cause it to be restrained. It can spend 5 feet of movement to escape from nonmagical restraints or being grappled.

Wall Climb: The Centipede may climb walls or the ceiling at the same speed.

Multiattack. The  Bone Reaver Centipede can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Claw.  Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 20 (4d6 + 8) slashing damage.

Bite. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 23 (3d10 + 8) piercing damage plus 9 (2d8) necrotic damage.

Frightful Presence. Each creature of the  Bone Reaver Centipede's choice that is within 120 feet of the Centipede and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the  Bone Reaver Centipede's Frightful Presence for the next 24 hours.

Form Shift: Once a minute the Centipede may shift form into one of three forms. Attack Form: The centipede losses all resistances but every attack it makes has advantage, it also gains one extra action. Defense Form: The centipede movement speed is halved, but it gains immunity to non-magical blunt, piercing, and slashing attacks, as well as gaining 4 AC and the reaction Retaliation. Acceleration Form: The centipede has disadvantage on all attack roles, but has its speed doubled, AC raised by 4, and gains the attack Charge.

Charge: +15 to hit, Reach 90ft, one target, The Centipede charges in a direction, trampling everything in its way for 30(5d10+5) blunt damage. it will not stop until it hits a wall, upon which it will be stunned. This ability is locked unless the centipede is in acceleration form.

Burrow: The centipede can burrow at 60 speed, magically refilling the earth behind it

Retaliation. The Centipede attacks with a claw attack (20 [4d6 + 8] slashing damage.) with advantage.

Bite or Claw. The Centipede makes a bite or claw attack

Cleaver Clang (Costs 2 Actions). Sends a ringing tone out in a 15 foot radius dealing 15(5d6) thunder damage to anything within the radius and knocking it 10 ft back. Each creature other than the Centipede must make a DC 15 DEX saving throw, on a failed save you are knocked back 15 ft instead, and knocked prone.

Slicing Throw (Costs 3 Actions). Detaches one of it's claws, throwing it as a projectile(10x10) in a strait line every creature must make a DC 18 DEX saving throw, or take 50(10d10) slashing damage. A successful throw takes half damage.

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