uncommon ne tiny fey gremlin 

Perception +7; darkvision

Languages Undercommon

Skills Acrobatics +8, Athletics +6, Intimidation +6, Stealth +8, Survival +5

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

Items light hammer

AC  18; Fort +9, Ref +10, Will +5

HP 35; Weaknesses cold iron 3

Soften Stone [R] Trigger A creature Strides or Steps into difficult terrain adjacent to the gnagrif; Effect The gnagrif gives the ground a hearty pound and it shifts beneath the triggering creature's feet. The triggering creature must succeed on a DC 18 Reflex save or fall prone.

Speed 20 feet, burrow 10 feet, climb 10 feet

Melee [>] light hammer +10 (agile), Damage 1d6+4 bludgeoning

Ranged [>] light hammer +10 (agile, thrown 20 feet), Damage 1d6+4 bludgeoning

Primal Innate Spells DC 16; 2nd shatter, speak with animals (at will); 1st ant haul, feather fall; Cantrips (1st) prestidigitation

Eat Rocks [>] The gnagrif gnashes and tears at an object or structure, dealing 2d4+2 piercing damage and ignoring Hardness 2 or lower.

Lurk [>>] Requirements A structure made from stone or earth is within the gnagrif's reach; Effect The gnagrif partially melds with the stone. It Geifoutrides Cover in the stone and makes a Stealth check to Hide.

Rubble Stride A gnagrif ignores difficult terrain caused by rocks or rubble, including squares affected by their Stomp Around.

Stomp Around [>] (move) The gnagrif huffs and stamps its feet, churning the ground around it. The square it is in and all unoccupied adjacent squares become difficult terrain.

Wrecker Whenever two or more gnagrifs use Eat Rocks on the same object or structure, the value of Hardness they can ignore increases by 1 for every gnagrif, to a maximum of Hardness 10.

Strength of Thousands #1: Kindled Magic, page 83.