I don't see Death Note as terror-inducing, for it's more like a tragedy than terror. It's basically a series of bad decisions and battles of morality that led to a lot of tragedies that made melancholic while reading it. And as for the other four, they're indeed terrifying—especially Tokyo Ghoul and Tomie!
Anyway, thanks for sharing~ Reading this one reminds me that I should really finish Tokyo Ghoul Re manga ahahaha