This small creature appears to be a humanoid-shaped being composed of electricity. Bluish-white lighting arcs in small bursts from its body.
Speed 30 ft., fly 60 ft. (perfect)
Str 10, Dex 17, Con 10, Int 6, Wis 11, Cha 15
15-foot cone of lightning, damage 1d8 electricity, Reflex DC 13 half. The save DC is Constitution-based and includes a +1 racial bonus. Creatures wearing metal armor take an extra +2 points of damage from a lightning mephit's breath weapon.
A lightning mephit takes 1d4 points of damage per gallon of water it contacts. Pouring water onto a lightning mephit requires a successful ranged touch attack. Water from other sources, such as spells or effects that create water but do not specify an amount in gallons, deal 1d4 points of damage per caster level to a lightning mephit within its area of effect. Damage from water-based attacks, like the slam attack of a water elemental, is increased by 50% against a lightning mephit.