If the mod is the last scum, then there has to be some kind of ruleset as to who the NK target would be. The mod wouldn't just have free reign over the kills, since he knows what everyone is. So there would have to be some sort of system. If Faerie is the last scum, he may or may not have rules for it.
From my perspective, and I know you can't effectively see this Math because we're not confirmed to you, the best play would be to hang Faerie, because the mod would (presumably) be stuck in his rules, and if my guess about the rule before is correct, then the target of the kill would be on me. You doctor me, and then we lynch the mod. If all of that is correct, then that's a guaranteed win for town. Unfortunately, you can't be sure of this hydra.
This is all really frustrating that we have no idea what's going on. A normal game of Mafia we would know "Hey, this is LyLo, you have to pick correctly here between these two people, or you lose". We don't know what will make us lose or not. The decision is entirely up to you, Math. If you decide to lynch the Mod, one of the two of us or Faerie will most assuredly follow you, as well as if you decided on one of us, the other would follow you.