Zoldeo is a member of the Grimoire Heart Guild and one of the Seven Kin of Purgatory through possession of Capricorn's body.  Zoldeo gained the Capricorn's key after Layla Heartfilia retired. He was expected to hand it over to Lucy when she was ready to use Magic, but he became twisted and corrupted, and swallowed up by the darkness. At one point, he broke a taboo of the Celestial Spirits by using his Human Subordination Magic and somehow ended up possessing Capricorn's body. It's because of this that Capricorn was able to stay in the human world for 17 years. At some point in time, he was found by Master Hades and joined Grimoire Heart, becoming one of the Seven Kin of Purgatory.   ~!He died after being forcefully removed from his possession of Loke's body.!~ (Source: Fairy Tail Wikia)

Across the Fiore kingdom, wizards join guilds and make their pay by filling magical needs—but one guild has a reputation as the roughest, rowdiest, most dangerous of all: Fairy Tail! 
When four young Fairy Tail members unite, their bond is forged by a power found in neither muscle nor magic and grows stronger with every mission. Whatever you do, don't mess with these friends or you'll get a taste of Natsu's flaming fist or Gray's ice hammer, suffer a painful blow from one of Lucy's celestial spirits or catch the edge of Erza's mighty blade! Whether they're stopping demons from devastating the world or wrestling in the mess hall, this mystical team manages to inflict as much damage to their rivals as they do to the surrounding area! 
 
(Source: Funimation)

The Grand Magic Games reaches its climax following Natsu Dragneel and Gajeel Redfox's stunning victory over Sting Eucliffe and Rogue Cheney of the Sabertooth guild. This success pushes the Fairy Tail guild closer to being crowned the overall champions, but obtaining victory isn't the only challenge they face. A mystery still surrounds a hooded stranger and the ominous Eclipse Gate, leaving more questions than answers. More crazy adventures are on the horizon for Fairy Tail as their destructive antics and joyful rowdiness continue unabated. Their greatest trial is quickly approaching, but united as a family, the guild will always be ready to face any threat that comes their way.

The final season of Fairy Tail.
 
Fairy Tail has been disbanded. A year later, Lucy comes into contact with Natsu and Happy. The three of them try to find the other former members' whereabouts to reconstruct the guild as they seek the real reason behind the guild's disbandment.
 
(Source: Anime News Network)

Cute girl wizard Lucy wants to join the Fairy Tail, a club for the most powerful wizards. But instead her ambitions land her in the clutches of a gang of unsavory pirates led by a devious magician. Her only hope is Natsu, a strange boy she happens to meet on her travels. Natsu’s not your typical hero—he gets motion sickness, eats like a pig, and his best friend is a talking cat. With friends like this, is Lucy better off with her enemies?
 
(Source: Kodansha USA)
 
Note: Includes 4 extra chapters.