n large earth elemental 

Perception +10; darkvision, tremorsense (imprecise) 60 feet

Languages Terran

Skills Athletics +12

Str +4 Dex +1 Con +4 Int -1 Wis +3 Cha +0

AC  20; Fort +14, Ref +9, Will +10

HP 72

Speed 50 feet, burrow 30 feet; earth glide

Melee [>] lance arm +14 (deadly d8, reach 10 feet), Damage 2d8+6 piercing and lancing charge

Melee [>] hoof +14, Damage 2d6+6 bludgeoning

Earth Glide An earthen destrier 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.

Lancing Charge If the destrier moved at least 10 feet directly before its lance arm Strike, it gains a +2 circumstance bonus to its damage roll.

Tilting Strike [R] Trigger The earthen destrier tramples a creature; Effect The earthen destrier makes a lance arm Strike against the creature it's trampling at a –5 penalty.

Trample [>>>] Medium or smaller, hoof, DC 20

Bestiary 2, page 108. Expanded in LOIL.