Forgotten Novel

Hello, there's a novel I wanted to reread but couldn't find the title of it. Here's what I can remember.

I read it on a mtl website so I'm not sure if it's been translated. The MCs cheat is that whoever directs killing intent towards him, they take on the negative effects/backlash of the moves or techniques the Mc uses. The Mc teams up with a healer guy and they eventually form a group themed around the underworld. The Mc uses his cheat to make pills for his subordinates.

I would appreciate it if anyone can recognize it and share the title.