Suicide, Korach's Cohorts, and the Most Controversial Sefer in Halacha

Source Sheet Did Korach and the 250 people with him know they would die? If yes, why did they go through with it? Is suicide considered murder? One Gemara learns it from "Lo tirtzach" and another learns it from "Ach Es Dimchem" in Parshas Noach. What is the Nafka Minah between the 2? Does someone who commits suicide get Olam Habah? Does one do aveilus for them? Say kaddish? Can one put themselves in danger to save others? Was Shaul allowed to take his own life? (Rameh M'panu says Shaul was a gilgul of Lemech) Is one allowed to commit suicide as Teshuva? Can one take their life if they are suffering? R Shaul Berlin vs R Rephael Hamburger Parshas Korach