n small aquatic fey 

Perception +6; low-light vision

Languages Aquan, Sylvan

Skills Athletics +6, Nature +5, Stealth +8

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

Wild Empathy The nixie can use Diplomacy to Make an Impression on and make very simple Requests of aquatic or amphibious animals.

AC  16; Fort +6, Ref +10, Will +6

HP 25

Speed 20 feet, swim 30 feet

Melee [>] claw +7 (agile, finesse), Damage 1d6 slashing

Grant Desire [>>>] (divination, primal) Frequency once per day; Effect The nixie can duplicate any 1st-level spell or produce any effect with a power level in line with a 1st-level spell, but only in response to the request or desire of a non-fey creature. The creature whose desire is granted can never again benefit from that particular nixie's Grant Desire ability.

Bestiary 2, page 183.