The Nemesis spawn that Natsu rocketed himself into is nearly ripped in half by the force, both of them whizzing by Zeref himself, who doesn't even turn to look at the damage. Hopefully, the wall behind them doesn't crack or dent.

"You're getting better," Zeref comments quietly. The other Nemesis spawn are already wheeling around, and leap off of the ceiling and the nearby walls, attempting to make up for the loss of numbers with speed.

"But Nemesis is, frankly, not that advanced of a Living Magic spell. Any novice in the Black Arts can do it after mastering Alive. You've seen what Living Magic is truly capable of already, haven't you?."

This was, after all, just practice. Zeref finally turns to Natsu. "If this is boring you, let me know."