I want to give the SS a name.

Are you sure you want to add darkness in front like your friends?

So ... here's the thing.

A nightmare in the dark

Charm in the dark

Mirror in the dark

Ura crab in the dark (Wu Li cartoon and its famous wild dwarf war, it's funny to think about it)

Actually, I think it's good to call it a nightmare spell, depending on your personal preference.