I dug up the dialogue. It should definitely be taken with a grain of salt, since its origin is unknown. Nevertheless, I like a lot how it connects all the loose threads from The Witcher 1 with Wild Hunt. IMHO, it's some pretty good writing that gives Eredin more space as well. The translation was probably done through Google translate from Polish, hence the grammatical inconsistencies.
"[rozpoczęcie dialogu]
[I need answers.]
[Didn't you already have them? You've been among us, you've been one of us, witcher.]
[I recover my memory, but I don't remember what happened after I joined the hunt.]
[You still didn't completely recover your memory? After all that time. How pity. We ventured through this world together many times, taking away childrens of their parents in countless towns and villages in seek for a child. Ciri's child. The one you once meet in Vizima. Alvin was his name? There also was a second child. The same as him, but grown. We almost got him in Aldersberg. It was a bad idea to erase his memory. We almost succeeded, but something went wrong and his mind got corrupted and unstable, and I doubt his memory were erased properly. That's probably explaining his hatred towards nonhumans and especially elfs. And in the end he escaped. We wouldn't need Ciri if only we had him. Young Alvin was in your hands a few years ago. You were the one who find him. A witcher with amnesia. And in the end it was your hands took his life. Pretty ironic, don't you think? Savior of the worlds was killed by a simple witcher. I think he didn't even realise that you will do this until very end.]
[I don't believe any word of yours, all I hear is just a pure speculation and lies.]
[I'm not going to convince you. We have our ways to find someone who travelling through time and space and there is only two people who did exactly that so easily. Only one now is among the living. And Ciri is our last chance. Only Avalac'h is standing between me an her. He want to use her for his own mysterious plans, am I right? We can save your and our world from White Frost right now, if you could bring her to me.]
[And what will happend next, Eredin? After when you save us from the White Frost? Conquer our and other worlds with Ciri as your puppet?]
[You know how this will end. If you want, you can become my general and be at my side when Aen Elle will triumph, Geralt. Although it doesn't matter what you choose, every decision you make will bring devastation. Each choice will lead to a greater evil. It's your Destiny, White Wolf. And it is time for you to decide.]"
