Fulminum Diem

Fulminum Diem is a magical spell allowing the caster to eat lightning to nourish themselves.

Use
When someone casts this and they get struck by electricity, the spell's effects "recharges" their magic power and gives them the feeling of eating a meal.

It was used by Khioneus Nevula when learning and when fighting the lightning elementals, as well as by Khyonessa Nevula.

Trivia

 * In Latin, this roughly translates to "day of lightning bolts." Fulminum is another spell that has an almost inverse effect--rather than absorb electricity, Fulminum discharges it.