Earth Elemental

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

Earthen Camouflage. The elemental's Stealth is 14 while in muddy, rocky, sandy, or stony terrain.

Elemental Nature. The elemental doesn't require air, food, drink, or sleep.

Elemental Resilience. The elemental is resistant to bludgeoning, piercing, and slashing damage from nonmagical attacks. In addition, it is immune to poison damage, to exhaustion, and to the paralyzed, petrified, poisoned, and unconscious conditions.

Siege Monster. The elemental deals double damage to objects and structures.

Multiattack. The elemental makes three Slam attacks, or it makes two Lob Stone attacks. If two Slam or Lob Stone attacks hit one creature, the target must succeed on a DC 16 STR save or be knocked prone.

Slam. _Melee Weapon Attack:_ +8 to hit, reach 10 ft., one target. _Hit:_ 14 (2d8+5) bludgeoning damage.

Lob Stone. _Ranged Weapon Attack:_ +8 to hit, range 20/60 ft., one target. _Hit:_ 21 (3d10+5) bludgeoning damage.

Earth Tremor (Recharge 4-6). The earth elemental causes the ground on a point it can see within 30 feet of it to rumble and shake violently. Each creature within 10 feet of that point must succeed on a DC 16 DEX save or be knocked prone.