I'm going to outline exactly why I think Xeiron is scum. I'm going to start with a bit of background, since not everyone here played or followed Shakespeare, I assume:
In Shakespeare, Xeiron was town, and during day 1, claimed to know that one of three players was scum. He was pushed on how he knew this, and ultimately it was revealed he got the information entirely from knowing that in the game, there was a lover-cop. His jumps in logic were bad, he came to a bad conclusion, but ultimately, he was town.
I think that coming into this game, Xeiron had to look at how he played Shakespeare, and if he wanted to play Shakespeare. There, he got himself and his lover lynched, and town very easily could have lost. If he's town, I think he is going to change how he plays, because how he played in Shakespeare ended up in disaster. I've seen a lot of people defending Xeiron because "He's playing similarly to how he played in Shakespeare", but I think scum!Xeiron is the one with the incentive to play similarly to how he played in Shakespeare. If he's scum, he knows that in Shakespeare he was mislynched for making ridiculous claims, so in a sense he's more free to make ridiculous claims, because he knows that people associate such claims with town!Xeiron. I think scum!Xeiron has more incentive to act like Xeiron from Shakespeare than does town!Xeiron. And I don't think acting like how Xeiron is acting here is an accident... he's being deliberately shady.
Furthermore, there are two key differences between Xeiron here and Xeiron in Shakespeare. In Shakespeare, Xeiron was not under pressure when he claimed, but he was here. Also, in Shakespeare, Xeiron's claims all dealt with information, while Xeiron's claims here are absurd. In addition to his claimed 1-shot cop power, he has claimed to be able to protect himself at night, and has reason to believe that there is a pen in the game.
A quick note on the pen thing: I don't think there is a pen in the game. All of the items we've seen so far are either somewhat completed machines (Phonograph, Telephone), or versatile items that could have many uses (electricity, paper). Pen doesn't fit here. It's only possible use (that I can think of) would be with paper, and we already have a Telephone that fulfills that role. Xeiron never explicity said why he thinks it exists... In #1042, all we get is, "I might or might not have more reason than the rest of you to think it exists." If he doesn't have more reason, I don't see what town!Xeiron benefits from saying that.. he's being deliberately cryptic, in an over-the-top way. I get the sense that he's not being cryptic to protect information... but he's being that way just to be that way.
Then we get to his "reads". He says that he has it narrowed down to four scum: TA, EFHW, Shraeye, Mail-Mi. When asked to explain his reads, he replied with "no". What?
You know who has an incentive to explain their reads? Town! So we don't mislynch! You know who has an incentive to not explain their reads? Someone who doesn't actually have them!
I really feel that Xeiron tried to get out of initial pressure by mimicking his play in Shakespeare, and once he realized that no one (other than me) found him that scummy for it, continued to turn up the ridiculousness. His play got more and more anti-town as the day went on. Without explanation, he said that there he had narrowed the scum team down to four possible players (two of whom have flipped town, btw!). He made ZERO attempts to working towards a correct lynch. His only contribution in terms of scumhunting was directing us towards mail-mi, who we now know is town.
I think it's suspicious that the items he claimed he needed were paper, which had already been revealed, and pen, which is the item most associated with paper. Isn't that awfully convenient?
Furthermore, the timeframe of Xeiron's plan doesn't make any sense! He's asking for pen and paper night one. Okay, so suppose he gets them N1. He immediately constructs the items, cool. So he now has a communication device. He may or may not have his investigative roles N1. Either:
1. He has his "investigative roles" N1: He uses them, and gets his results. He either lives to Day2, at which point he shares his results publicly with the thread, or dies N1, at which point he's dead. He doesn't get a chance to share his results with his communication device.
2. He doesn't have his "investigative roles" N1: Okay, so he's presumably going to have them during Night2. But, he won't have his results until the end of N2! He can write during N2, but he doesn't have his results yet, so what good can it do him? He's already missed his chance to write another player!
If Xeiron's communication device is to be used to pass on his results, it can still be used for something else, right? In fact, Xeiron states as a possibility: "I am trying to make a communication device so that someone else will get my information and be able to carry out my plan in case I should die." We know the information part doesn't make any sense, so does the instruction part? No! You're a 1-shot cop, as you've claimed, so any utility you provide will ultimately come from your items! How are you going to give your items to someone else? And even if you have some on-death role which allows you to give your items to a player of your choice when you die, they're not going to be able to use them until N3. So it's going to be a long time before they're able to get any results.
Xeiron's plan just doesn't make any sense. He's going out of his way to be shady and cryptic, he's been extremely unhelpful, has explicitly refused to explain his (incorrect) reads. Every single action he has taken in this game has been anti-town. Every single one! What makes more sense in this case? An extremely mistaken town member, or a scum member who knows he has a meta of acting similarly to this and is taking it to the next level because he is confident he won't be found scummy for it? I certainly know which one I think it is.