Wandering Rock

Wandering Rock (Plancta) CR 15

XP 51,200
N Colossal outsider (earth, elemental, extraplanar)
Init -1 Senses darkvision 60 ft., tremorsense 60 ft.; Perception +19

AC 17, touch 1, flat-footed 18 (-1 Dex, +16 natural, -8 size)
hp 232 (16d10+144)
Fort +14; Ref +9; Will +10 DR 10/-; Immune elemental traits

Speed 20 ft., burrow 20 ft., earth glide
Melee 2 slams +26 (2d10+12/19-20)
Space 30 ft.; Reach 30 ft.
Special Attacks clashing

Str 50, Dex 8, Con 29, Int 10, Wis 11, Cha 11
Base Atk +16; CMB +44 (+46 bull rush, overrun, or sunder); CMD53 (55 vs. bull rush, overrun, or sunder)
Feats Awesome Blow, Cleave, Greater Bull Rush, Greater Overrun, Improved Bull Rush^B, Improved Critical (slam), Improved Overrun, Improved Sunder, Power Attack
Skills Appraise +16, Climb +36, Knowledge (dungeoneering) +16, Knowledge (planes) +19, Perception +19, Stealth +2
Languages Terran
SQ

Environment any (Plane of Earth)
Organization solitary, pair, or gang (3-8)
Treasure none

Clashing (Ex) Whenever an ally of a wandering rock makes a successful melee attack roll against a creature or object the wandering rock threatens, the wandering rock may make a slam attack against that same creature or object as an immediate action. Any slam attack made in this manner deals +8d6 damage. This additional damage is not multiplied on a critical hit.

Freeze (Ex) A wandering rock can hold itself so still it appears to be an inanimate rock formation. A wandering rock that uses freeze can take 20 on its Stealth check to hide in plain sight as an inanimate lump of rock.