Golem, Stone, Greater (CR 16)

Huge Construct
Alignment: Always neutral
Initiative: -2 (Dex)
Languages: Cannot speak

AC: 27 (-2 size, -2 Dex, +21 natural), touch 6, flat-footed 27
Hit Dice: 42d10+40 (271 hp); DR: 10/adamantine
Fort +14, Ref +12, Will +14
Speed: 20 ft.
Space: 15 ft./15 ft.
Base Attack +31; Grapple +52
Attack: Slam +42 melee
Full Attack: 2 slams +42 melee
Damage: Slam 4d8+13
Special Attacks/Actions: Slow
Abilities: Str 37, Dex 7, Con -, Int -, Wis 11, Cha 1
Special Qualities: Construct traits, immunity to magic
Feats: -
Skills: -
Advancement: -
Climate/Terrain: Any
Organization: Solitary or gang (2-4)
Treasure/Possessions: None

Source: Web

Slow (Su): A stone golem can use a slow effect, as the spell, as a free action once every 2 rounds. The effect has a range of 10 feet and a duration of 7 rounds, requiring a DC 31 Will save to negate. The save DC is Constitution-based.

Immunity to Magic (Ex): A stone golem is immune to any spell or spell-like ability that allows spell resistance. In addition, certain spells and effects function differently against the creature, as noted below.

A transmute rock to mud spell slows a stone golem (as the slow spell) for 2d6 rounds, with no saving throw, while transmute mud to rock heals all of its lost hit points.

A stone to flesh spell does not actually change the golem's structure but negates its damage reduction and immunity to magic for 1 full round.