The Black Wizard(OC Zeref x SDS)

Fanfiction Description:

For centuries, Zeref was thought to be nothing more than a myth—until he walks onto the battlefield of Liones. Mentor to Merlin, best friend to Meliodas, and a sorcerer feared by history itself. He returns with power sealed and secrets buried. His arrival will shake Britannia to its core.

But why has he returned? And what does his presence mean for the future?

Disclaimer:

The Seven Deadly Sins belongs to Nakaba Suzuki, and Fairy Tail belongs to Hiro Mashima. This is fanfiction made, and I don't own these characters.