Infiltrate

At the same time as Emery was pleading with the prominent figures of Zodiac City, a certain group of people were also moving and taking action within the magus academy in preparation for the impending disaster. 

For the past twenty minutes, Klea, accompanied by Anas and Sigurd, had been busy scouring through the Academy cube device, looking for information they might be able to use. 

Their efforts managed to earn them several pieces of information regarding the Magus Academy's defenses and the potential ways the elves could have infiltrated it.

First, was through the air using a spaceship.

In this case, any attempt of entry by unauthorized vehicles would immediately be stopped by a barrier powerful enough to disintegrate a large warship into nothingness. Said barrier's effectiveness was due to the fact that it was powered by the Light Institute's God Crystal, which was guarded by Grand Magus Aurora.