Yes, well, now you are talking about the Arcane.

[She tries to put on her best smile for him. The Arcane has been a part of them for as long as anyone can remember, but learning all the Common terms for it was never a priority.]

I am sorry, I do not know how to explain in this language. Like... you know how ice melts, and it becomes water? Or steam, if it's boiled? Mana does something like that, and mages draw out the energy from the change.