Bone Golem

Immutable Form. The golem can't shape-shift.

Built To Protect. Unless ordered by its creator to do otherwise, if the Bone Golem moves more than 40 feet from its creator, it feels compelled to return to a tile within a 25 ft. Emanation around its creator. The Bone Golem will do all it can to return, even if it will take attacks of opportunity but will avoid any terrain that will cause its death such as a chasm or large pit.

Fuelled By Necromancy. Whenever the golem is subjected to Necrotic damage, it regains a number of Hit Points equal to the Necrotic damage dealt.

Self-Destruct. When the Bone Golem reaches 0 or fewer Hit Points, the Bone Golem perishes and all creatures within a 10ft. Emanation around the Bone Golem must make a DC 15 Dexterity saving throw, taking 4d10+4 Piercing damage on a failed save or half as much damage on a successful one. If the Bone Golem's creator perishes before the Bone Golem is able to use its Self-Destruct trait, Bereft Of Purpose immediately overrides the Self-Destruct trait.

Bereft Of Purpose. If the Bone Golem's creator perishes, the Bone Golem immediately perishes, its bones turning into ash, without using its Self-Destruct trait.

Multiattack. The golem makes two attacks, using Claw or Bone Javelin in any combination.

Claw. Melee Attack Roll: +5 to hit, reach 5ft. one target. Hit: 25 (3d6+5) Slashing damage.

Bone Javelin. Ranged Attack Roll: +1 to hit, reach 60/180ft. Hit: 13 (3d6+1) Piercing damage. Success or Failure: The Bone Golem loses 9 (2d6+1) Hit Points.

Osseous Regeneration. If the Bone Golem is within 4ft. of a skeletal undead it may restore 2d8 Hit Points. If the skeletal undead has been damaged by the radiant damage type in the current encounter, the Bone Golem instead restores 1d4 Hit Points. The skeletal undead is destroyed in either case.

Guard The Master. The golem takes the Help, Dash or Disengage action.

Osseous Shield. When its creator is within 30ft. and is attacked, the Bone Golem uses its reaction to create a floating shield made from bone that intercepts the attack, increasing the AC of its creator by +4. The effect lasts until its creator receives 1 or more damage. The Bone Golem may not use this reaction to accumulate AC bonuses as the effect does not stack. The Bone Golem loses 3d6 Hit Points each time it uses Osseous Shield.