Hogwarts is in danger, everything drown in darkness because Voldemort had rule the wizard world, all of aurors in the castle to protect Harry Potter and students.

"Protego Maxima. Fianto Duri. Repello Inimigotum."

Tobirama raise his wand, cast a spell to protect over all the castle. After the spell, his eyes narrow with a frown. Looking out the dark forest in ready position to fight in this battle..