Hi! Firstly, I really like what I've read so far. It's very intriguing and I definitely want to know what happens next.
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I love the descriptions you have, they're nicely done and drew me in right away. I could feel the bleakness of the cell and the desperation that Kaheran felt, and the uncertainty of his situation.
I only noticed one grammar mistake, you start one sentence with "and" and you actually don't need it there,the sentence works fine without it. And one spelling mistake a little further down from there. It's the scene where the guards are approaching his cell. the line reads, "He couldn't", and it looks more like it should read, "They couldn't".
Overall the first chapter is very well written and draws the reader in with well written descriptions and a bit of mystery. I can't wait to read more of this.