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In the mist-covered Paradise of Darkness, Gabriel was like a ghost, moving without making any noise.
Even though Yoan stood near Eliana, Gabriel was still able to kill him without anyone else even finding out. That was made even easier since no one expected him to be skillful enough to be able to kill Yoan in such a short time.
Another thing that came in handy was that the Paradise of Darkness was a spell that was unknown even to the Academy. The Academy heads only knew that their founders had some unique spells, but other than that, they didn't know anything.
They didn't even know that the spell that Gabriel was using was one of those secret spells of their founders.