Well... mysterious in that nobody knows what happens after death, I mean. Is there paradise at the end? Constant pain? Infinite nothingness? Death is an unknown, and that's what scares the shit out of most mortals, I think. Most.

[There's something conspiratorial in the way Mahito leans inward; something alluring and inviting. Dito's smile grows wider.]

I assume you don't just mean filthy rhetoric when you're talking about curses.