The Shadow.

The Shadow refers to a high elf who became a warlock, who then bonded his soul with the deepest darkness, thus becoming a shade. He started his rise to power in 435 SD, he surrounded himself in black enchantments. As he gained power he joined the Cult of the Unholy Throne, where quickly ascended ranks, until he was second to Helldock, a Nendros human warlock, who was afraid for his position, so he ordered the assassination of The Shadow, who's name is unknown. The assassins were easily destroyed by the master warlock, the Shadow then killed Helldock in a magician's duel. The Shadow grew more and more in power in the wizard world, he took control of many cults and orders of wizards, all united with the same goal: to find the Unholy Throne. Finally, the Shadow started to attack the kingdoms of Eilendor, spreading his dark rule over many parts of the world. He then challenged the power of the Dragon Riders, who fought to push his rule from the free lands still left. Many of the Riders died, and many of the Shadow's followers, then Kunder, a human wizard Rider and his silver dragon, Alasa, flew to the Shadow's fortress in the Radulla Mountains, in the north of Elben, where he fought the Shadow, and unable to kill him, sealed the Shadow in an ancient oak tree. Kunder's blood line continued down to Otorin Derenson, who lives in Althor. The oak tree stands to this day, sealed with the Rider's mark, still holding the trapped vestige of the Shadow.