Earth Elemental

Large elemental, neutral

Armor Class: 17 (natural armor)
Hit Points: 126 (12d10+60)
Speed: 30 ft., burrow 30 ft.

STR: 20 (+5)
DEX: 8 (−1)
CON: 20 (+5)
INT: 5 (−3)
WIS: 10 (+0)
CHA: 5 (−3)

Damage Vulnerabilities: thunder
Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities: poison
Condition Immunities: exhaustion, paralyzed, petrified, poisoned, unconscious
Senses: darkvision 60 ft., tremorsense 60 ft., passive Perception 10
Languages: Terran
Challenge: 5 (1,800 XP)
Proficiency Bonus: +3

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.

How many for your party

Copies of the earth elemental (1,800 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Earth Elemental for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 4	—	—	1	2–20
Level 6	1	—	2	3–20
Level 7	1	—	2	3–20
Level 8	1	2	—	3–20
Level 9	—	2	—	3–20
Level 10	—	2	3	4–20

In these lists

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Questions

What CR is the Earth Elemental?

The Earth Elemental is challenge 5, worth 1,800 XP, with a proficiency bonus of +3.

How many hit points does the Earth Elemental have?

126 hit points (12d10+60), with AC 17 from natural armor.

How many should I use against four 4th-level characters?

Against four level 4 characters, 1 is hard by the encounter XP budget.