Rockwood 2014

CR 6 elemental

Huge elemental, chaotic neutral

Armor Class: 17 (natural armor)
Hit Points: 94 (9d12+36)
Speed: 30 ft., burrow 15 ft.

STR20 (+5)

DEX8 (-1)

CON19 (+4)

INT10 (+0)

WIS15 (+2)

CHA10 (+0)

Saving Throws
Skills: Perception +2
Vulnerabilities: thunder
Resistances: nonmagic B/P/S attacks
Damage Immunities: poison
Condition Immunities: exhaustion, paralyzed, petrified, poisoned, unconscious
Senses: darkvision 60 ft., tremorsense 60 ft., passive Perception 12
Languages: Sylvan, Terran
Challenge: 6 (2,300 XP) · Proficiency Bonus +3

Earth Glide.

Can burrow through nonmagical unworked earth/stone with o disturbing material it moves through.

Elemental Nature.

Doesn’t require air food drink or sleep.

Persistence of Stone (Recharge: Short/Long Rest).

When reduced to below half its hp max Fossil Barrage recharges.

Roiling Roots.

Its stony roots make the ground within 15 ft. of it difficult terrain for creatures other than the rockwood.

Siege Monster.

Double damage to objects/structures.

Towering Reach.

Doesn’t have disadvantage on ranged attack rolls from being within 5 ft. of a hostile creature though it may still have disadvantage from other sources.

Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details