One would expect something like a magical portal to be more present in the curriculum at a bloody magical school. Though, I suppose since there's supposedly no way to return, the lessons wouldn't have made much of a difference anyway. Still, something like this might've been a bit useful over the last few years.
What year is it?
[ ooc; Hermione from a world where the Battle of Hogwarts was just the beginning of a much longer war that the Death Eaters had a bit of an upperhand in. Muggleborns are being arrested and/or killed on sight, and so she was in the process of navigating a small army of them across the Scottish highlands in search of more fighters. ]