Dao

The dao can burrow through nonmagical, unworked earth and stone. While doing so, the dao doesn't disturb the material it moves through.

If the dao dies outside the Elemental Plane of Earth, its body dissolves into dirt, and it gains a new body in 1d4 days, reviving with all its Hit Points somewhere on the Plane of Earth.

The dao has Advantage on saving throws against spells and other magical effects.

The dao has a 30 percent chance of knowing the Wish spell. If the dao knows it, the dao can cast it only on behalf of a non-genie creature who communicates a wish in a way the dao can understand. If the dao casts the spell for the creature, the dao suffers none of the spell's stress. Once the dao has cast it three times, the dao can't do so again for 365 days.

The dao makes three Earthen Maul attacks or two Earth Burst attacks.

Melee Attack +10, reach 5 ft. 20 (4d6 + 6) Bludgeoning damage. If the target is a Large or smaller creature, it has the Prone condition.

Ranged Attack +10, range 120 ft. 15 (2d8 + 6) Bludgeoning damage.
Earth explodes from the target's space, creating the following effect. DEX Save DC 16, each creature in a 10-foot Emanation [Area Of Effect] originating from and including the target.
Failure: 10 (3d6) Thunder damage.