Yeah, I felt pretty good about how to get runes, but not how to cash them in. It seemed like sometimes the fireball was available and sometimes it wasn't with the same number of runes, but things got pretty hot and heavy there!
Ah yeah the mechanic isn’t well explained - but the gist is, moving gives you ingredients, and will provide you with abilities.
E.g. 1 purple, 1 red lets you use fireball - but once you use it, you lose its ingredients.
I hope that clarifies things :)
