What does a Rune look like?
The heavens answer you.
With a resounding crack, you look back to see a small fracture opening up to swallow one of the nearby pines; as the tree is swiftly plunged into its azure depths, a stone tablet is suddenly flung from its branches and heads straight toward the pair of you, curving in an arc through the air.
It was quite pretty, you could see, and it was also about to give you a concussion.