Ophiolite

Large elemental, neutral

Armor Class 20 (natural armor)
Hit Points 52 (8d10+16)
Speed 30 ft., burrow 10 ft.

STR	DEX	CON	INT	WIS	CHA
16 (+3)	14 (+2)	15 (+2)	2 (-4)	12 (+1)	5 (-3)

Skills Perception +3, Stealth +4
Damage Resistances Bludgeoning, piercing, and slashing from nonmagical attacks not made with adamantine weapons.
Damage Vulnerabilities thunder
Damage Immunities poison
Condition Immunities exhaustion, poisoned
Senses darkvision 60 ft., tremorsense 60 feet, passive Perception 13
Languages —
Challenge 4 (1,100 XP)

SPECIAL TRAITS

• Stone Camouflage. An Ophiolite has advantage on Dexterity (Stealth) checks made to hide in rocky terrain.

ACTIONS

• Bite. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 8 (1d10+3) piercing damage, and the target must make a DC 12 Constitution saving throw, taking 22 (4d10) poison damage on a failed save, or half as much damage on a successful one.

ABOUT

Ophiolites are creatures that may have originally been called from the Elemental Plane of Earth and look like serpents made of stone, typically dark green but possibly other colors as well. Monsters of this sort can be found in any size but Large ones are typical of those that might be encountered in mountainous areas.

Ophiolites’ physical characteristics make it easy for them to go unseen in rocky terrain, even if they are not actively trying to do so. They can burrow through anything up to the consistency of rocky earth but not through anything as resilient as bedrock and — in that they are very sensitive to loud sounds like thunder — they often use this capability to lurk just below the protective surface of the ground.

Ophiolites are not particularly aggressive but are sensitive to vibrations and hate being unexpectedly touched or stepped on. They will typically respond by lashing out at whatever has upset them and attacking it with their razor-sharp fangs and powerful mineral poison.

Their rock-hard hides make them much harder to damage than normal creatures.

An Ophiolite’s brain, heart, liver, and kidneys are composed of gem-quality serpentine, and if a character knows to look for these and is able to successfully harvest them they will typically be worth about 400 gp altogether for a Large creature of this sort.