Jellal

Erza has an unexpected connection to Jellal, who used to be her comrade in the past. He rules over the Tower of Heaven, aka the R-system, in other words a forbidden magic used to resurrect someone from the dead! While Natsu and the gang try and infiltrate the tower to save Erza and Happy without really knowing what's going on, the Council, now aware of the tower's existence, begins to make a frightful decision in order to destroy it...Source: crunchyroll