n large earth elemental 

Perception +17; darkvision, tremorsense (imprecise) 90 feet

Skills Athletics +18

Str +6 Dex +1 Con +6 Int +0 Wis +5 Cha +0

AC  28; Fort +18, Ref +13, Will +17

HP 145

Speed 30 feet, burrow 20 feet; earth glide

Melee [>] tail +20 (forceful, reach 10 feet, versatile piercing), Damage 2d12+9 bludgeoning plus calcification

Calcification (incapacitation, primal, transmutation) A blow from a granite glyptodont's tail hardens the flesh of the creature struck. The target must succeed at a DC 26 Fortitude saving throw or become slowed 1 (or slowed 2 on a critical failure). Further failed saves against calcification increase the value of the slowed condition. Once a creature's actions are reduced to 0 by calcification, that creature becomes petrified. If the creature isn't petrified, the slowed conditions end once 1 minute passes without the creature failing a save against calcification. Every 24 hours after it was petrified, the creature can attempt a DC 26 Fortitude save to recover. On a success, it becomes flesh again, but is slowed 1 for the next 24 hours. On a critical success, the creature recovers and isn't slowed. On a failure, the creature remains petrified, but can try again in 24 hours. On a critical failure, the petrification is permanent, and the creature can't attempt any more saves.

Earth Glide A living boulder can Burrow through earthen matter, including rock. When it does so, it moves at its full burrow Speed, leaving no tunnels or signs of its passing.

Elemental, Fire Fire elementals sometimes incorporate burning materials into their being, or possibly superheated materials such as molten rock or searing smoke.

Bestiary 2, page 109. Expanded in LOIL.