This weird creature looks like a giant tumbleweed whose form crackles and sparks with electricity.
AC 19, touch 14, flat-footed 15 (+3 Dex, +1 dodge, +5 natural)
Speed 30 ft., fly 30 ft. (perfect)
Individual tumblesparks are drawn to positively charged beings such as those wearing large amounts of metal armor. They slam into them discharging blast after blast of electrical energy until the positively charged victim loses its own charge usually as a result of the victim's demise. Against smaller foes, a tumblespark simply rolls over them, dealing crushing and electricity damage.
Once per round, a tumblespark can release a jolt of electricity against a single opponent within 10 feet that deals 4d6 points of electricity damage. A successful DC 14 Fortitude save reduces the damage by half. The save DC is Constitution-based.
A tumblespark's natural form is a ball of dancing and arcing electricity; it is not solid, nor is it incorporeal. Any piercing or slashing attack has a 20% miss chance against a tumblespark. Bludgeoning attacks deal damage normally.