n tiny air elemental 

Perception +7; darkvision

Skills Acrobatics +9, Stealth +9

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

AC  19; Fort +5, Ref +11, Will +7

HP 18

Speed 5 feet, fly 50 feet

Melee [>] jaws +11 (agile, finesse), Damage 1d4+5 electricity

Arc Lightning [(move, electricity, primal, transmutation) The spark bat transforms into lightning that arcs to a large piece of metal within 100 feet, such as a suit of metal armor or a metal weapon. The bat then returns to its normal form in a space adjacent to the metal. This movement doesn't trigger reactions.

Bestiary 2, page 106. Expanded in LOIL.