Thread:Achrones150/@comment-4509522-20120317161833/@comment-1149803-20120317170825

Jellal, after getting captured and tortured, will be confronted by a dark entity claiming it to be the Dark Mage of Legend known as Zeref. The entity will corrupt him, feeding off of his hatred of his captors.

While this is happening, Erza and Tsukishiro will split off from each other in an attempt to look for Jellal. Erza gets to him first, but finds him brutally killing the guards. He decides to take over the tower (something that was used in an attempt to resurrect Zeref). Erza decides against it, prompting him to attack and turn on her. When Tsukishiro comes across the scene, Jellal will convince him that Erza betrayed them, despite her protests. In the end, Tsukishiro decides to side with Jellal and turn his back on Erza. However, they spare her and allow her to leave the island. Tsukishiro leaves a last message for her to get stronger so that they can fight each other later on.

That's basically the backstory of it.