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@leavemelikeudo yes, actually. So, you make it as gut-wrenching as possible. You want the readers to be able to feel the pain. Make the reactions realistic, may that be the torture(s), tortured, watchers, or saviors. Have realistic torture methods, ones from the medieval ages work splendid, but you can also include more present technologies like guns and knives and shit (I find that a mix of both works wonders on getting people.)
Now, if it's less of wanting the readers to feel the pain, don't make it as bad as you can. I mean, you can, just fewer details will have to go into it and thats not very fun, it's better when you can write all that you want.
I'm scared of how this information may possibly be used, but I look forward to reading something like that.
I'm not the devil, I swear.