The Fateless One is the protagonist in Kingdoms of Amalur: Reckoning, a mortal being who was resurrected in Fomorous Hugues'Well of Souls - the first and last "true" success of the project before the Tuatha Deohn destroyed it. The Fateless One has no memory or recollection of life before the resurrection and soon finds out he/she possesses power equal to that of gods as the only being capable of changing the fate of events, for better or worse.
The Summer Fae'sHigh King Titarion and the world tree, Nyralim, show some worry about the possibilities that the Fateless One's impact could have upon the future of Amalur, as it is impossible for any Fateweaver to see what impact the Fateless One will have upon any event. Even the Tuatha are moving to hunt down and kill the Fateless One for reasons of their own. Others, like Alyn Shir, who appears to have known the Fateless One before his/her death, see much hope that the Fateless One can bring an end to the war with the Tuatha, however.
The Fateless One once worked as part of a secret organization that's sole mission is to keep the existence of Tirnoch a secret from the world to ensure no one attempts to free her. To get into Bhaile, in order to assassinate Gadflow and reseal Tirnoch, the Fateless One managed to get hired by Templar Octienne to be a personal assistant to Fomorous Hugues' former partner in his Well of Souls project, Ventrinio. Working to assist him in his research, the Fateless One went along and gathered massive amounts of Prismere as a power source for his well. Ventrinio was so impressed by the Fateless One's efforts, he attuned his/her soul to his Well of Souls. After having gathered enough, he went on with his main mission in secret, only telling Ventrinio that he/she was going to search for the true source of the Prismere.
The Fateless One failed in their attempt to kill Gadflow and reseal Tirnoch once again, just as the Fateweavers had foretold. But Tirnoch planned to use the Fateless One as the instrument of her revival. Knowing that the Fateless One would return, she made it so that he/she was resurrected by the Well of Souls created by Hugues.
Before his/her death, the Fateless One was ruthless, cunning and murderously cold-blooded according to dialogue with individuals who met him/her pre-mortem. In fact, the Fateless One's personality may have been more vile than that of Tirnoch's. The Fateless One now changes the history of Amalur. Whether it is for a better future or one far worse than the Tuatha planned, is not known.
I've seen the fate of every soldier in that battle, and none of them were to survive past that day. I do not know what you are, or how you are doing whatever it is you are doing, but I am glad you are on our side.
Blessed Lyria. I know you! That's right. The last time I saw you was when you dangled from the Balor like a drop of spittle on a bolgan's chin. Mercy! The Hero of Mel Senshir. I'd know the face anywhere.
You never talked about yourself, but you were... you were terrifying, okay? You were the coldest, most terrifying thing I've ever met! You wouldn't have threatened me like this -- you would have just stabbed me to death and looted my corpse. Seriously, I saw you do that to people! Often!
You didn't like talking about yourself. Actually, you didn't like much of anything. Honestly, you were a terror to be around... But you've changed! I can tell! Before you died, you would never have been this... diplomatic. You probably would have knifed me for answers by now.