In general, any magic that requires a Magi to chant more than two sets of syllables is a highly powerful advanced spell. However, it likely isn't Forbidden Magic, as large-scale offensive Forbidden Magic requires at least thirty sets of syllables.
Xie Yao uttered the final syllable, and instantly a radiant gate opened in the sky. Two angels with pristine white wings descended through it, pouring a beam of white light down below that enveloped an area roughly 100 by 100 yards. All the skeletons within the range of the light dissolved into nothingness, vanishing completely. Outside the range, skeletons trembled under the divine light, too terrified to move.
A moment later, the angelic figures disappeared, and the radiant gate in the sky closed.
