[Viktor is quiet for a long moment, as if debating whether or not he's going to answer the question, but ultimately he lowers his voice and nods.]

I have, yes.

[He hasn't told anyone this outside of Jayce and Alucard, preferring to let Ciri handle her own people, when it came to their little excursion. Technically, no one is supposed to know about it, but he thinks he can navigate the conversation without mention of how he got there.]

You can't get past the edge of the crater--it pulls you into the Horizon. I believe one of our number took measurements, once. The force of the magic it contains seems to be slowly pulling everything towards it, though not at a rate that's concerning.

[A geological time scale, as far as he knows.]