Slaughterstone Eviscerator (CR 12)
AC: 29 (-1 size, +20 natural), touch 9, flat-footed 29
Hit Dice: 15d10+30 (112 hp); DR: 10/adamantine
Fort +5, Ref +5, Will +5
Speed: 30 ft.
Space: 10 ft./10 ft.
Base Attack +11; Grapple +24
Attack: +2 adamantine blade +21 melee
Full Attack: 4 +2 adamantine blades +21 melee
Damage: +2 adamantine blades 2d8+11/18-20/x3
Special Attacks/Actions: Augment critical, enhanced mobility
Abilities: Str 29, Dex 11, Con -, Int -, Wis 11, Cha 1
Special Qualities: Construct traits, resistance to acid 10, cold 10, electricity 10, and fire 10, tunnel fighting, SR 20
Feats: Whirlwind Attack
Advancement: 16-30 HD (Large); 31-45 HD (Huge)
Organization: Solitary or gang (2-4)
Monster Manual III
Augment Critical (Ex): A slaughterstone eviscerator's adamantine blades are magically hardened and honed to a razor's edge. They threaten a critical hit on a natural attack roll of 18-20, dealing triple damage on a successful critical hit. The blades are not subject to effects such as keen edge that would further improve their threat range.
Enhanced Mobility (Ex): A slaughterstone eviscerator can move up to 15 feet in a round and still make a full attack.
Tunnel Fighting (Ex): A slaughterstone eviscerator has a limited ability to reshape its form to fir into a tight area. It does not take a penalty on attack rolls or to Armor Class when squeezing through a tight space. See page 29 of the Dungeon Master's Guide for more information on squeezing through tight spaces.
A slaughterstone eviscerator approaches combat with the uncaring and brutal precision that most constructs exhibit. When confronted with a large group of foes, an eviscerator uses its enhanced mobility to move toward the largest concentration of foes that it can reach and cut them down.
Lacking ranged attacks itself, a slaughterstone eviscerator is at the mercy of highly mobile groups with powerful ranged attacks. For this reason, dwarves and other races that employ slaughterstone eviscerators usually support them with a number of archers or spellcasters capable of striking down foes determined to fight from a distance.
This subtype usually is used for elementals and outsiders with a connection to the Elemental Plane of Earth. Earth creatures usually have burrow speeds, and most earth creatures can burrow through solid rock.