n huge earth elemental 

Perception +20; darkvision, tremorsense (imprecise) 90 feet

Languages Terran

Skills Athletics +24, Stealth +14

Str +7 Dex -1 Con +8 Int +0 Wis +3 Cha -1

Earthbound When not touching solid ground, the elemental avalanche is slowed 1, can't use reactions, and can't Trample.

AC  32; Fort +26, Ref +17, Will +21

HP 215; Immunities bleed, poison, paralyzed, sleep

Spike Stones (aura, earth, primal, transmutation) 10 feet. Spikes of rock rise up from all stone surfaces in the emanation, creating difficult terrain. A creature moving in the terrain takes 2d8 piercing damage for each square of spikes it moves into (a Large or larger creature takes damage only once for each square it moves, even if its space covers multiple squares of spikes). Creatures with the earth trait ignore all effects within the area. The elemental avalanche can disable or activate spike stones as a single action, which has the concentrate trait.

Crumble [R] Trigger The elemental avalanche takes damage from a hostile source while atop rock or earth. Effect The elemental avalanche crumbles into the ground, Burrowing down 10 feet. This Burrowing does not trigger reactions. The elemental avalanche can't Crumble again for 1d4 rounds.

Speed 25 feet, burrow 25 feet; earth glide

Melee [>] fist +24 (reach 20 feet), Damage 2d12+11 bludgeoning

Ranged [>] rock +24 (brutal, range increment 80 feet), Damage 2d12+7 bludgeoning

Earth Glide The elemental avalanche can Burrow through any earthen matter, including rock. When it does so, the elemental avalanche moves at its full burrow Speed, leaving no tunnels or signs of its passing.

Trample [>>>] Large or smaller, fist, DC 30

Bestiary, page 147. Expanded in LOIL.