The Scene
Xath, in character, told Justice that she didn't want any memories of the Bluestar because of the madness that she feels every time she tries to access info about Mordred. As for the information that Xath gave the Bluestar about Mordred, here it is. No complete prophecies, just tidbits.
Darkness reigns as liege once, and again
Should the sword of Kings fall to Goddess’ son!
Death will not bar midnight’s Imperator!
Along the way, Mordred claims both thrones (Falcon and Dragon), diverting a small part of his Fists to subdue the Caesarian Emperor. He is actually of truer blood than either of them (although his immortality remains a mystery) and because most of the imperial armies are fighting Maelwys and Destro on Prydein, there is little resistence on the continent.
After Mordred is defeated at Caer Hextor, the war dies down to limited skirmishes, but within 5 years, Maelwys is undisputed King of Prydein and the Ringed Continent.
Mordred had risen to claim the throne over all of the ringed continent by reuniting the sundered dragon empire (Caesaria and Byzantium had once been part of the same empire, but the throne had been sundered by the petty wars of a hundred generations). For a little over a year, Mordred the Black was Emperor over all the Ringed continent, and his capitol was at Caer Hextor, his home on Mordred's Isle
However, the legends say that after the battle in which Mordred was killed and his armies scattered by the forces of the resurrected Falcon Kingdom , Aregonn found something in the dark, arcane libraries of Mordred's castle...something that changed him.
4000 BL (1932 nd year of the Falcon) Tiamat, disguised as a mortal, seduces Morgath. Unkown to Morgath, a son is born of the union—Mordred the Black.
2730 BL (1253 rd year of the Dragon) Mordred the Black establishes Caer Hextor on an island south of Prydein. He then organizes the Fists of Hextor, a mercenary company.
4 BL (2223 rd year of the Sundered Empire) Aron Greyclaw allies himself with Mordred the Black, bringing with him (officially) the Kingdom of Prydenisti Elves.
2 BL (2225 th year of the Sundered Empire) Mordred the Black claims both parts of the Sundered Throne, proclaiming himself (correctly) heir to the united Dragon Empire. Mordred turns the united might of 2 empires against the rebellious Prydein. While Gorak and a dwarven warlord, Arutha Bloodaxe, lead the Falcon King’s army against the forces of Emperor Mordred, the Woodshadow, the Apecto, the Amastacia, Aregonn Bluestar, General Zao Jade and Quarion the Great lead a second army against Mordred’s stronghold at Caer Hextor. The Woodshadow kills Aron Greyclaw, and his son Daran, making himself rightful King of the Prydenisti. The Apecto brings his holy Light to bear against Mordred, revealing his true, monstrous form (a Shadow Dragon). The gathered forces defeat Mordred’s army, and Mordred himself is killed shortly after.