n small earth elemental 

Perception +9; crystal sense, darkvision

Skills Athletics +11, Survival +9 (+11 to Track)

Str +4 Dex -1 Con +3 Int -4 Wis +2 Cha -1

Crystal Sense A sod hound can sense crystals or gems within 60 feet.

AC  19; Fort +12, Ref +6, Will +7

HP 44; Immunities bleed, poison, sleep

Speed 30 feet

Melee [>] jaws +11, Damage 1d10 + 6 piercing plus Knockdown

Earth Glide The sod hound burrows through any earthen matter, including rock. It moves up to 20 feet, leaving no tunnels or signs of its passing.

Knockdown When the sod hound succeeds at its jaws Strike, it can use this action immediately after to automatically knock over the target, giving the target the prone condition.

Beginner Box, page 63.