His background?

"Not good!" The grey-robed Meteor Knight trembled upon seeing the teenager take out a spell scroll.

The teenager focused on him. Clearly, this young man targeted the Meteor Knight with whatever powerful magic the scroll contained.

Hong! Hong! Hong! Hong! Hong! Hong!

Several huge green thunderbolts flashed down from the clear sky, striking the ground and creating a virtual forest of electrified green flashes! Among these densely packed thunderbolts… eight of them, twisting, struck the Meteor Knight. The knight had no time to dodge. With a hong, his entire body was atomized into ashes.

Normally, without a spell scroll, even a Silver Moon mage would require significant casting time before being able to cast such a powerful grade-five thunder spell; however, the power such a magic would produced would be unimaginable.