You and your friends are the brightest first year students at the School of Magic. Use that talent to cast spells/chants that will help you find a Portkey for returning. After traveling to the School of Magic, the portal at Kings Cross Station has mysteriously stopped working. Thankfully, you and your friends are the brightest first year students. You must use that talent to learn new spells and chants that will help you find a Portkey that you need to escape. Be careful, though. Magic is a mysterious thing and can reverse effects if not used carefully.