"Possibly, but that's a little tricky," Cressida said, "You would need to infuse it daily and also be careful about its strength. What you want to keep out. What you want to lead in. Basic wards are good for generality, but selective wards take a little more practice and also detective work." Because Cressida didn't believe in handing out spells to students. No, she encouraged them to learn on their own once they got the foundation.
Cressida then went through the instructions of the basic ward. Symbols and what to be wary of, and how as with most magic, pronunciation was important. She then motioned for Ripley to step forward, "Now, we'll go through this step-by-step and you just keep going if you feel comfortable trying it on your own."