(Technically you can't show an element unless you demonstrated your magic, but whatev)
"Intresting," Nicole says thoughtfully. Mia, this person has Fire and Shadow. Want to help me think of a challenge for her to prove herself? she asks. "I will have a challenge for you by morning. For now, feel free to explore the castle. Stay out of rooms that have a 'DNE' sign. It means 'Do not enter'. A servant will lead you to a guest room for the night."