First, thanks for the compliments on my Curses and hopefully you'll like their wielders as well. Just be warned, when I right for evil characters or dark scenes, thinks get a little. . . graphic as far as the combat goes. I'll try not to go overboard with it, but still, if I do then please let me know.
Second, MAWR CURSES!!!!
Swift Curse- A-Rank: This curses allows the user to move so fast, they might as well be teleporting, as well as increased reaction time, reflexes, and senses. As such, the user will be extremely hard to hit unless they've pinned down to a certain area.
Nightmare Curse- A Rank: A self debilitating curse that worries away at the users sanity in order to feed itself. In order to slow the process, the user must feed it the mental energies of others, leaving the victims comatose for the rest of their lives. Offensively, this power takes an opponents deepest, darkest fears and brings them to life. This takes time, especially for multiple people, and thus it's best for the user to stay out of the action until they are ready. The user can also manipulate fear into a type of energy, using it to fight when necessary.
The aging curses sounded good,but I think some think like that would be more of an S-class thing and both of those spots are taken, plus I don't trust myself not to go overboard with it.