Green Lightning (青信号, Aoshingou) is a Lightning Magic Spell.
Green is the secondary colour of Thor's lightning. An unusual colour, it is almost emerald in appearance, with a slight hint of translucency, it is rarely ever to be pinpointed in environments with much forest and plant-life within it. The most notable feature of this lightning is that is possesses an almost solid form when used. Instead of being wild and untamed with several discharges, the lightning's form is in condensed beams, which, although unable to be redirected, have much more piercing power than standard lightning.