MADK https://www.mangago.me/read-manga/madk/
It was more so horrifying. I loved it tho. Very funny and unserious considering the stakes at hand (I say this but it's more so from a lack of adequate vocabulary... It's also been a while so I think I've distorted the events in my head, that being said, go enjoy it tiger)
https://www.mangago.me/read-manga/heartless/ (i forgot the exact story but it's gory plus depressing iirc)
https://www.mangago.me/read-manga/no_reason/ (lots of rape. you want the mc to die by the end just so he can finally have some peace)
https://www.mangago.me/read-manga/misu_misou/ (depressing)
https://www.mangago.me/read-manga/lima_syndrome/ (lots of rape. i would suggest not reading the description or any comments and just heading straight into rhe story to have a better experience)
if you count 'sad as shit' under "traumatizing" then read https://www.mangago.me/read-manga/my_broken_mariko/
https://www.mangago.me/read-manga/kami_no_kodomo/ (story of a sociopath. has rape)
https://www.mangago.me/read-manga/hikaru_ga_shinda_natsu/
It's ongoing and not super gory but I'm looking forward to the climax, who'll give out first? Who'll lose first? Who'll die first?
What's the most traumatizing, horrifying manga/manhwa uve read? I want to try them (idc if it's bl/gl/smut) Thanks in advance ❥