
Okay, in the last 2 episodes after stabbing Sigma, Fyodor allows Sigma to touch him and learn about his ability. Sigma gets overwhelmed with the knowledge and then either dies (which is why Fyodor allowed him to learn about his ability) or passes out.
The headache comes with the fact that it SEEMS like Dazai really did successfully kill Fyodor. (This might be released in the next chapter or the one after that). But that means that in the end we're never going to learn what Fyodor's ability was. Is it that he's another unique case like Ranpo ? Or did he really have a special ability? If he's really dead then that means there's only one person (and possibly a second*) who knows what his ability is and that's Fyodor. Which means Fyodor might actually be alive or he'll survive long enough to share what he learned about Fyodor's ability. Or my theory is that maybe Fyodor's ability is something unique and when Sigma touched him, Fyodor actually activated his ability and used it on Sigma (I wouldn't be surprised if his ability is activated by touch because that would just be another parallel to Dazai). What if it's an ability that allows him to transfer his consciousness into another person? So his body may be dead now but his mind is alive in Sigma? Before dying he says something in Russian that translates to My God, my God, why hast Thou forsaken me? Which is a line in the Bible, said by Jesus when he was crucified (but then is resurrected) Idk, but that's my theory. It's either Sigma unfortunately is dead, is close to death or Fyodor used his ability on Sigma.
*For the second person that may know of his ability. When he left the prison and he thought Dazai was dead he made mention of Dazai being the second person to actually physically harm him (the hand injury he got) so it could be that there's someone out there that knows about his ability or enough to harm him
whats with sigma tho