Earth Elemental

Earth Elemental CR: 5

Large elemental, neutral

Armor Class: 17 (natural armour)

Hit Points: 126 12d10+60

Speed: 2 ft , fly: 30 ft , burrow: 30 ft

STR

20 +5

DEX

-5

CON

8 -1

INT

20 +5

WIS

5 -3

CHA

10 +0

Damage Vulnerabilities: Thunder

Damage Resistances: Bludgeoning, Piercing, and Slashing from nonmagical weapons

Damage Immunities: Poison

Condition Immunities: Exhaustion, Paralyzed, Petrified, Poisoned, Unconscious

Senses: Darkvision 60 ft, Tremorsense 60 ft, passive Perception 10

Languages: Terran

Challenge Rating: 5

Earth Glide. The elemental can burrow through nonmagical unworked earth and stone. While doing so, the elemental doesn't disturb the material it moves through.
Siege Monster. The elemental deals double damage to objects and structures.

Actions

Multiattack. The elemental makes two slam attacks.
Slam. Melee Weapon Attack +8 to hit, reach 10 ft, one target. Hit 14 2d8+5 bludgeoning damage.

Earth Elementals are from the Elemental Plane of Earth and are either summoned by spellcasters or other creatures to the Material Plane. A few make through portals leading from their home Plane.