Meracydia is a location in Final Fantasy XIV, and is currently inaccessible. Lying to the south of the Three Great Continents of Aldenard, Ilsabard, and Othard, Meracydia is one of the main landmasses of Hydaelyn.
Meracydia once flourished with many cultures and races. These included a race of tree-like beings that worshiped Sephirot the Fiend, a centaur-like race devout to Zurvan the Demon, a large unified group of differing races and groups under Sophia the Goddess, and lastly the First Brood dragons Bahamut and Tiamat alongside their children.
During the ending years of the Third Astral Era however, the Allagan Empire with the newly revived Emperor Xande sought to conquer Meracydia. Initial forays by the Allagan military proved successful, but against a united front of the native peoples and dragons they began to stall. However, this only proved to motivate Allagan scientists to produce even stronger chimerical weaponry. Eventually Bahamut was slain by the Allagans in a decisive battle.
After Bahamut's defeat, the tribes of Meracydia managed to summon their gods, beings known as Eikons (presently referred to as Primals). There was no recorded summoning prior to the Allagan incursion, yet with multiple simultaneous summonings suggests that a third-party such as the Ascians were involved. The three most prominent eikons summoned were Sephirot, Sophia, and Zurvan, referred together as the Warring Triad. The Eikonic forces managed to push the invaders back to the Meracydian coastline. Xande was infuriated by this setback, and threatened his cadre of mages to kill one a day until a solution was found. The tasked mages in turn researched Eikons and soon developed a form of spellcasting that gave birth to the Summoner. With this magic, the Allagans imprisoned the Warring Triad and had them taken to Azys Lla for containment and research until they were slain by the Warrior of Light five milennia later.
Despite all this, the wyrm Tiamat, mate of Bahamut, attempted to summon him as an Eikon. However Tiamat's emotions of grief and rage twisted the shade of Bahamut into a creature of pure violence.This once again pushed the Allagans back, and drove them towards even more technological and magical advancement. Communication with Voidsent was achieved, and Xande held an audience with the Cloud of Darkness. In exchange for infinite fresh corpses for use as Voidsent vessels, Xande convinced them to fight against the Meracydians.
As the undead army killed any who opposed them, the newly dead were inhabited by additional Voidsent. Eventually the shade of Bahamut was overrun. They were then fitted with Allagan neurolinks, devices that allow for complete control over a dragon. Later Bahamut was sealed inside of the false moon Dalamud, and propelled into the heavens. At an indeterminate time, Tiamat was also captured and taken to Azys Lla. Despite being able to escape her current bonds, she remains imprisoned by her own will out of regret for her summoning. Additionally, various other creatures and structures were taken from Meracydia and placed in Azys Lla as objects of research and trophies of conquest.
After the end of the war, Meracydia was rendered to almost entirely a wasteland. Even after the fall of the Allagan Empire some regions of the continent still remain uninhabitable, with reclusive populated areas that often attacking any who approach.
Due to the constant threat of attack, very little of the region is known. It is known to be just at the south of Eorzea.