The Lightning Rune is considered together with the Fire Rune as one of the primary offensive runes. While the Fire Rune mostly targets enemy groups, the Lightning Rune focuses on one individual. Therefore it is perfectly suited for boss battles unless they are thunder resistant. A few enemy group or column spells are also among this rune's abilities.
Although certain spells are recurring in every game, they sometimes have different effects or names. The Lightning Rune is a good example to show how rune powers have been adjusted to the particular gaming worlds circumstances. A combination of Lightning and Fire Runes offers mages a very capable repertoire to conquer most regular enemy forces.
The renowned "Blue Lightning" Flik carries this rune at all times and he is only one of many characters who make use of the power of lightning. During the Gate Rune War Sheena is the only one who is permanently equipped with Lightning Rune, which can be a bit annoying sometimes seeing as it is still a low-level elemental rune, though a rather powerful one at that.
The high elemental magic of the lightning element is provided by the Thunder Rune, child of the True Lightning Rune. - Celes