Zeref nodded in greeting, his attention immediately turning to the bottles of purple liquid. While he had no doubt in his mind that Xul's intentions were genuine, Mavis was right; ethernano didn't quite work like that, but maybe that didn't matter. But even if it didn't...

"I appreciate the offer, but I will have to decline. With all due respect... my magic is dangerous enough as it is." Not that Xul's life mattered to Zeref (and he really, really wouldn't want it to matter to him), but as a matter of tactics, friendly fire is a non-starter. And Xul was simply too useful for Zeref to allow that to happen.

"But if I become wounded or exhaust too much of my magic, I will give it a try."