Stone giants are not the largest of giants, but with an average adult standing 12 feet tall and weighing roughly 1,500 pounds they are still formidable. There is no substantial difference in height between males and females. They usually dress in heavy leather clothing with sections having been boiled to stiffen them; these outfits serve as armor and give them the first AC above. Stone giants are reclusive, but they will defend their territory (typically in rocky mountainous terrain) against any who trespass therein.

A stone giant can throw large stones up to 300’ for 3d6 points of damage. They will fight in groups to defend their territory but use only simple, basic tactics and strategy.

Stone giants live in mountainous locations exclusively in caverns or otherwise in the earth. They are most active at night. Three-quarters of the time stone giants have 1d4 cave bears guarding their homes. When encountering more than 4 stone giants, the first four are male and additional individuals up to 6 will be female. More than 6 will be immature and will only have a percentage of adult capabilities. Females are not as formidable as males, and are comparable to hill giants in terms of attack, damage, and hit points.

Stone giants sometimes share their lairs with cave bears.

Stone giants are partially named for their stone-like complexions and iron coloured eyes. Their hair is also dark-stone coloured, sometimes with hints of blue. Whereas hill giants often use wooden clubs, stone giants prefer stone and wear skins the colour of stone.