Cast on a nearby surface, it explodes for 50 points of shock damage when enemies come near.
Lightning Rune is an apprentice level Destruction spell that creates a rune which will explode when enemies come near, causing shock damage to health and magicka. You can't cast it just anywhere. When you press the cast button, the cross-hair will let you know if you are pointing at a valid surface within range. If it is red, then you can't cast the spell there.
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