Cult of Zeref

The cult of Zeref were an unnamed cult who operated from the Tower of Heaven.

History
The cult kidnapped people from numerous villages to have them aid in the construction of the Tower of Heaven. After an incident, the cult's leadership changed hands to the former slave Jellal Fernandes after he was possessed by the Grimoire Heart Dark Mage Ultear Milkovich and proceeded to murder the priests who were previously in charge.

Under Jellal's leadership the cult also had partnerships with multiple Dark Guilds, including the Oración Seis, which was primarily made up of former slaves of the cult, and Death's Head Caucus.

The cult was taken down in X784 with the defeat of Jellal and the destruction of the Tower of Heaven.

Location and Building
The cult were located in the Tower of Heaven.

Goal
The cult's primary goal was to resurrect the legendary Black Wizard Zeref in order to attain "paradise".

The cult also aimed to resurrect the demon Deliora through manipulating Team Lyon and their followers in order for the creature to be used as a powerful weapon.

Unbeknownst to the cult however, their current incarnation was actually created to act as a distraction so that Grimoire Heart could more easily achieve their own goals.

Strength
In it's initial incarnation, the cult possessed multiple divisions, guards who utilized ordinary weaponry and were backed-up by monstrous dog-like creatures as well as a Magic Division that utilized Magic Troops.

The ordinary guards were overpowered by the slaves, while the Magic Division proved capable of driving them back, however they in turn were overpowered when the young Erza Scarlet unlocked her magic abilities for the first time.

In it's present day incarnation the ordinary members of the cult proved no match for the members of Team Natsu and Juvia Lockser. However the members of Team Jellal proved tough foes for Team Natsu and defeated them in their initial encounter. Their leader Jellal Fernandes was powerful enough to be recognised as one of the Ten Wizard Saints through his alter-ego Siegran and his right-hand Ultear was actually the leader of Grimoire Heart's Seven Kin of Purgatory.