Gildartz Clive is one of the S-Ranked Mages of the Conquistadores and the most powerful Mage in the Guild, not including Zev himself. Whether or not he's equal in strength to Zev is widely debated. Even less is known about Gildartz than Mistgun, at least as far as the story is concerned - this is due to the nature of missions that Gildartz takes.
In 150,077 CMT, Gildartz departed the Conquistadores Guild to complete a mission of the highest rank: A One Hundred-Year Mission, a mission of such difficulty that it should take someone a century to finish it. He also took up a Ten-Year Mission at the same time. Incredibly, he managed to complete both missions in only three years, and returned to the Conquistadores soon afterwards. Apparently, such feats are normal for him. Upon hearing rumors that Gildartz was returning, the Conquistadores prepared a party for his return, which, to everyone's surprise, was also partially prepared by Laxus Dreyar, who is usually reluctant to show respect to Gildartz (or anyone else, for that matter).
When Zev returned to the Conquistadores in 150,082 CMT (two years after Gildartz's apparent return to the Guild), he asked Mirajane Strauss if Gildartz had made it back. Mirajane replied that Gildartz was recovering at his house elsewhere on Hei Fon 4. Namah expressed her worry that Gildartz had been hurt, but the conversation was interrupted before Mirajane could specify exactly what his injuries were.
- All of Gildartz's known appearances in BZPB were lost in the Great Dataclysm. His only surviving canon "appearance" was when Mirajane mentioned that he was "recovering" several years later.
- In Japanese, Gildartz's name is ギルダーツ ・クライヴ (Girudātsu Kuraivu). The given English translation is Gildarts Clive, though it could also be interpreted as Gildartz.
- Gildartz Clive (revision on 13:16, Dec 24, 2011): "Gildartz has been gone for the past three years, doing a mission of the highest rank -- A One Hundred-Year Mission, a mission of such difficulty that it should take someone a century to finish it. At the same time, he took up a Ten-Year Mission, and that has been occupying his time as well. However, the rumors say that Gildartz is making his way back to the Conquistadores Guild at the present time, having finished the requirements for both missions in only the three years he was gone; apparently this is normal for him. [...] Everyone in the Guild respects Gildartz -- Even Luxus Dreyar, who barely even respects Zev, who's the Guildmaster. (Although it's a begrudging respect for both on his part.) A party is being prepared for Gildartz's return, and to everyone's surprise, Luxus is helping prepare for the festivities."
- BZPB #8770 (May 08, 2012)