Arthur left his office during the middle of the night. The goal he had was to find the ship that was coming with the new batch of students, and infiltrate using his invisibility spell.
He flew away from the island with his fire wings and hid his body with a black cloak. The appearance Arthur had now resembled a powerful mage.
Wisa had told him the route the ship would take, so not that hard to find the ship, although it still took him a while.
After 3 hours of flying, Arthur finally spotted the ship, the same one he had used a long time ago when he arrived.
There was no one strong enough inside to notice his moves. The youths there were happily resting inside their rooms when Arthur arrived.
"Lesser Invisibility."
A magic circle formed in midair and enveloped Arthur, making him vanish from the eyes of others.
The spell was still tier 1, which meant that healthy people could see through his invisibility, but it was enough to deal with those students.