n small beast incorporeal spirit 

Perception +9; darkvision

Languages Common, Sylvan; tongues

Skills Acrobatics +6, Deception +6, Stealth +8, Survival +5

Str +1 Dex +3 Con +0 Int +2 Wis +2 Cha +1

AC  16; Fort +5, Ref +8, Will +7

HP 14; Immunities poison, precision, disease, paralyzed

Speed 40 feet

Melee [>] horn +6 (finesse, magical), Damage 1d8+1 force

Melee [>] jaws +6 (agile, finesse, magical), Damage 1d4+1 force

Primal Innate Spells DC 17; 3rd wanderer's guide; 1st detect poison, purify food and drink; Cantrips (1st) guidance, read aura, stabilize; Constant (5th) tongues

Bond with Mortal [>>] Frequency once per day; Effect The spirit guide forms a bond with a mortal creature. While the bond exists, the spirit guide increases their current and maximum Hit Points by 10, gains a +2 status bonus to their attack and damage rolls, and can communicate telepathically with the bonded mortal as long as the two beings are on the same plane. The spirit guide can only be bonded with one mortal at a time, and they can take this action again to end the bond or to form a new bond (which also ends the old bond). The bond also ends if the spirit guide or the mortal dies. This bond strengthens the spirit guide's connection to the Material Plane. While bonded, the spirit guide loses the incorporeal and spirit traits, loses their immunities and resistances, and changes their Strikes to deal the appropriate physical damage (typically piercing or slashing) instead of force damage.

Bonded Strike [>>] Requirements The spirit guide is currently Bonded with a Mortal; Effect The spirit guide makes a jaws Strike. If this attack hits, the bonded mortal can spend their reaction to Strike the same target.

Bestiary 3, page 252.