Bone Construct

Multi Attack: The  Bone Construct can make two attacks with its bone axe.

Bone Axe:. Melee Weapon Attack : +7 to hit, reach 10 ft. one target. Hit: 11 (1d12+4) slashing damage.

Bone Storm: Recharge (5-6) The Bone Construct flies apart, it's constituent bone shards whipping out in a hurricane of bone shards. The Bone Construct dematerializes  until the start of its 2nd turn from when it starts the Bone Storm. In its place appears a 25x25 foot square of whirling bones. Any creature that starts or ends it's turn makes a dexterity saving throw with a DC of 15 taking 2d6 damage, or half that should they succeed. On the turn after the Bone Storm starts, the Bone Construct can move its Bone Storm at the speed it normally moves. At the start of it's second turn after using Bone Storm, the Bone Construct re materializes anywhere within the Bone Storm effect.

Bone Spike: The Bone Construct summons a bone from underground to pierce the feet of those who seek to destroy it. The Bone Construct targets two creatures. They must make a dexterity saving throw with a DC of 10. If they fail, they take 1d10 damage, and are immobilized. At the start of their turn, they may make a DC 10 constitution to grit their teeth and pull their foot off the spike, or an adjacent friendly creature may make a strength check with a DC of 15 for a medium creature or DC of 10 for a small creature to pull their ally off the spike.