Buildling

Warming Hearth. When taking a short or long rest inside this creature. You gain the befits of the Bess spell and Protection from Evil and Good. 

Natural Made. These beings are naturally formed over time and thus can eat rock, stone, and plant material like trees. And if damaged and can eat any of them while not being attacked, regain 5d6 hit points while not unconscious.

Evil Begone. Evil-aligned creatures can not enter this being.

Ageless Sleep. When Reduced to 0, hit points will appear to be destroyed and are unconscious until they regain their total hit points, and they will slowly rebuild themselves and reawaken. Until then, they have a speed of 0 and can not move. Or if a creature casts mending on it, use the spell-casting ability plus their Constitution modifier and the Buildlings Constitution modifier. And will automatically rebuild and reawaken. But will permanently die when any part of them is shattered.

To Bits. When unconscious, any part of them can be broken, thus rendering them permanently dead. But as a response, they will violently erupt in primordial magic, dealing 6d12 force damage. But the lingering magic will heal the land, sprouting plant life around them and sprouting exotic rare plants native to the region. 

Immutable Form. The Buildling is immune to any spell or effect that would alter its form.

Magic Resistance. The Buildling has an advantage on saving throws against spells and other magical effects.

Magic Weapons. The Buildling weapon attacks are magical.

Multiattack. The Buildlings make four melee attacks.

Action Melee Attack. Melee Weapon Attack: +8 to hit, reach 15 ft., up to 4 targets. Hit 24 (3d12 + 8) [Bludgeoning] damage. 

Bonus Action Ranged Attack. Chimney Shot Attack: +8 range 10/80ft. 1 Target. (4d12 + 8) [Fire/Bludgeoning] damage.

Bonus Action Ranged Attack. Flame of the Chimney 45ft Cone, Each creature in that area must make a DC 21 Dexterity saving throw, taking 63 (18d6) fire damage on a failed save or half as much damage on a successful one.