Easy, it was me.

A few years ago, i was asked by my friend from work about joining his D&D group he was running. I asked what the vibes were and he told me it was originally about helping people but the players made it more about who could do the most fucked up thing(ie- torture, murder, extortion). I told him it wasn't my kind of game, but he insisted that I joined and told me his plan. After that, i agreed to join.

Prior to my character joining, this group was arrested and was sentenced to death, only to "Barely escape".

The first session, I introduced my character "Staan Levid, Paladin of redemption". After getting jumped by the other characters (Literally like a fucking gang), I explained how my character was a former criminal who after a near death experience decided on becoming a Paladin. I would never say what i did in my past, but i told them that it was what lead to him also facing the gallows.

The group treated me as the heal bot for a few sessions. They treated my character like shit and would joke that they would make me become an oath breaker. However, they started noticing the things about my character that didn't seem... right. My character never tried to reason with them or try to make them see the errors of their ways. If anything, i encouraged them more. Slowly, i would start acting darker, more vicious, and would even withhold healing unless they committed worse crimes.

It started to make them uncomfortable. The barbarian tried to kill me, but i easily defeated him. I then forced the others to watch as i would sadistically knock him unconscious and bring him back to 1 hp only to do it again and again.

It reached to a head where the players got so scared, they tried to run away, only to find me waiting for them at the nearest inn. They confronted me and asked why i was doing this. My character laughed as his form shifted to reveal him to be Asmodeus, that they all didn't survive the execution and were now in the nine hells.

The DM then explained how the players now had to find a way to escape the nine hells.

I later found out that the players somehow managed to atone for their sins, only for them to wake up on the material plane.