They went inside the graveyard using the hole Arthur created in the barrier. Now, someone had to launch a powerful spell as a surprise attack, and that person could not be Seth!
Seth had to fight against the other rank 2 mage, which means he could not waste his energy before the fight. So, out of everyone present, Arthur had to be the person to do that.
"All right. Everyone, my attack will destroy the tunnels and rooms beneath us, so prepare to fend against lots of students who will march toward us." Arthur said to the other mages who were nearby.
The spell Arthur cast was a meteor, infused with his first essence. Fire! It took some time for him to fully cast it. A tier 11 spell was no joke!
Magical circles kept appearing in front of Arthur's hand, stopping only after eleven circles were formed. These circles had strange symbols, runes, which gathered the mana from the atmosphere, turning into fuel to ignite the meteor!