Black Cloveris now heating up thanks to the manga kicking off its final arc, and one awesome cosplay is slowing things down just a bit by highlighting Secre Swallowtail! First introduced to the series as the anti-magic bird named Nero that seemed to cling to Asta immediately, it was then teased there was something even deeper going on with Nero given its intelligence and the fact that it was aware of the magic stones Asta and the others were fighting for. It was then revealed that Nero was actually a disguise for a young girl who once worked with the original Wizard King centuries ago.