Golem, Drakestone (CR 15)

Large Construct
Alignment: Always neutral
Initiative: -1 (Dex)
Languages: Cannot speak

AC: 36 (-1 size, -1 Dex, +28 natural), touch 8, flat-footed 36
Hit Dice: 35d10 (192 hp); DR: 10/magic and adamantine
Fort +12, Ref +11, Will +13
Speed: 30 ft.
Space: 10 ft./5 ft.
Base Attack +26; Grapple +41
Attack: Bite +36 melee
Full Attack: Bite +36 melee and 2 claws +31 melee and 2 wings +31 melee and tail slap +31 melee
Damage: Bite 2d8+11, claw 2d6+5, wings 1d10+5, tail slap 2d6+16
Special Attacks/Actions: Petrifying breath
Abilities: Str 33, Dex 8, Con -, Int -, Wis 13, Cha 15
Special Qualities: Construct traits, immunity to magic
Feats: -
Skills: -
Advancement: 36-50 HD (Large); 51-70 HD (Huge)
Climate/Terrain: Any
Organization: Solitary
Treasure/Possessions: None

Source: Draconomicon

Petrifying Breath (Su): Once every 1d4 rounds, a drakestone golem can exhale a 30-foot cone of petrifying gas (Fortitude DC 27 negates).

Immunity to Magic (Ex): A drakestone golem is immune to all spells, spell-like abilities, and supernatural effects, except as follows. A transmute rock to mud spell slows it (as the slow spell) for 2d6 rounds, with no saving while transmute mud to rock heals all its lost hit points.

A drakestone golem opens any combat with its petrifying breath, but otherwise relies on its devastating physical attacks to reduce foes to a pulp.