In my current Eberron campaign, one of the characters is a warforged akashic (the akashic is a class from Monte Cook's Arcana Unearthed for those who don't know; basically, it's a class that can access the communal memories of all living beings). The class/race combo started my mind racing, and I started thinking of reasons for his creation (he remembers very little about himself, even though he remembers other peoples' memories quite often). I've started borrowing a little bit from Hellboy for his background, though more in the sense that he was created for a terrible purpose that he doesn't realize yet. Basically, he was created thousands of years ago by servants of the quori, during the invasion of Xen'drik. He was constructed as a sort of living key, a way for the quori to get back into the world in the event of their banishment (which, of course, happened). He doesn't know any of this yet, but it'll be interesting when he finds out. At any rate, the reason for his akashic abilities is that he's actually accessing memories through a sort of communal dream consciousness, as a side effect of the purpose for his construction.