Ultimate Magic World

The Ultimate World of Magic is a state in the world of Earth Land where only Mages would be able to survive. It would be a world where only Mages would be able to live, and those without Magic would live terrible lives. If Zeref is awakened, the Ultimate World of Magic is possible. Since 90% of the humans on Earth Land are not Mages, the human population would decrease drastically. Or even if they did live, it would be "Hell on Earth", as described by Rustyrose. The Ultimate World of Magic is the main goal of the Grimoire Heart Guild, and Zeref would be the leader.

Description
As described by some of the Grimoire Heart Mages, the Ultimate World of Magic would be ruled by "chaos" and "darkness". Anybody with Magic would eventually die, or live "Hell on Earth". Rustyrose said it would be a paradise for Mages to use their Magic. Those who want the Ultimate World of Magic see non-Mages as useless existences.

Grimoire Heart
The Ultimate World of Magic is Grimoire Heart's main goal. Once Hades left Fairy Tail, he at some point became interested in finding the Essence of Magic. Hades arrived at Zeref and realized he could use him to create the Ultimate World of Magic. Hades told a young Ultear this, and she aided Hades on his quest. For years Grimoire Heart traveled collecting "keys" to awaken Zeref. Grimoire Heart was able to find Zeref in his sleeping state on Tenrou Island, and invaded it to capture Zeref's body and free him. It is still unknown why Hades personally wants the goal to be achieved. Their struggle still continues.

Lost Magic
In the Ultimate World of Magic, Lost Magic can be used at their full capacity. This was explained by Hades to a young Ultear. After Hades found out about her past, he offered to teach her how to use Arc of Time. He told her in the current state of the world, only bits and pieces of the Lost Magic are known, but if the Ultimate World of Magic were to be complete, it could be used at its full capacity. This means Arc of Time could not only age things, but also be used to travel through time to change history.

Resistance
Currently, the Fairy Tail Guild has been trying to stop Grimoire Heart. Elfman and Evergreen conveyed Fairy Tail's beliefs on the issue during their battle against Rustyrose. Elfman stated that the Mages of the world supported those without Magic, and the commoners rewarded them. Elfman also said it was the trust between Mages and non-Mages that made Earth Land, and why not having Magic should not be considered a burden.