This creature looks like a dark storm cloud, with sparks suggesting eyes and long sweeping arms charged with bolts of lightning.
Large Lightning Elemental
Speed fly 100 ft. (perfect)
Melee 2 slams +13 (1d8+3 plus 1d6 electricity)
Space 10 ft.; Reach 10 ft.
Special Attacks metal mastery, spark leap
Str 16, Dex 23, Con 14, Int 6, Wis 11, Cha 11
Base Atk +8; CMB +12; CMD 29
Feats Dodge, Flyby Attack, Improved Initiative, Mobility, Weapon FinesseB
Skills Acrobatics +17, Escape Artist +17, Fly +12, Knowledge (planes) +9, Perception +11
Environment any (Plane of Air)
Organization solitary, pair, or gang (3–8)
Though most think of the Plane of Air as a vast expanse of clear sky, that plane also holds the power of the storm, including monstrous hurricanes larger than entire worlds and thunderstorms whose peals and claps can shatter stone. Whether lightning elementals are the by-product of common air elementals spending too much time near these electrically charged storms or are merely calved off like forgotten flurries, they are aggressive and almost suicidal in their willingness to leap into battle. They particularly enjoy attacking creatures that are made of metal and creatures that wear metal armor or wield metal weapons.
Many lightning elementals have a roughly humanoid shape, but some prefer animalistic shapes (particularly birds and dragons), and a few appear to be nothing more than large disembodied heads made of dark clouds with flickering lightning tongues. Regardless of the shape a lightning elemental takes, the air around the creature hums and throbs with the promise of electrocution and the tangy stink of ozone.