I seem to remember something about Eragon's mother (the Black Hand) killing twelve enemies with only the knowledge of the spell "heal". How did she do this?
I can't find any quotes and I can't even remember which book it was mentioned in!
This appears to be the relevant quote from the third book in the cycle.
"She healed them of their fear and their hate and all things that drive a man to kill. And then while they stood grinning at each other like idiot sheep, she went up to the men and cut their throats.... Are you feeling well Eragon? you are as pale as a corpse."
Brisingr, Pp 286