When did Snape invent his curses?

[smartone564]

No: HPFGUIDX 133773

TrekkieGrrrl wrote:
Isn't spells usually something you have to practice in? Yet Harry 
> got the Sectusempra to work at first attempt, and he's not usually 
that good 
> in Charms, is he?

Smart: Yeah, I wondered about that too.  But it's a Dark Arts spell, 
which don't seem to rely that much on skill, like charms, but more on 
feeling.  Harry was having trouble using effective Unforgiveable Curses 
(OotP), but Sectum wasn't likely to be as powerful or as menacing.  If 
Harry did recieve some of Voldemort's power, like Parseltounge, for 
whatever reason, he may have an affinity for them already.