So it had to be the correct rune biased on the meaning? Seemed simple enough. But then, runes could be deceiving like that. Simple one second and hard the next.

Heather flipped her textbook open to the list of runes and their meanings and looked it over. At first, nothing jumped out at her as being a good match for any spell. But the longer she looked, well, there it was. "Kenaz could be used with Lumos, since kenaz means torch and Lumos basically turns your wand into one." Unless kenaz was talking about torching something, in which case it would be Incendio. But she thought her original answer was the correct one.