I am currently GM'ing Rise of the Rune Lords with a group of 4. Last week the party reached the Big Bad of the first mod, and was pretty much TPK'd due to some poor saves against a fear effect. However I decided not to kill them for two main reasons. First I don't think it's fair to kill the entire group in a situation where they didn't do anything exceptionally stupid and simply had some bad luck. And second, two of the players as well as myself are also in a group that is currently playing Carrion Crown. The reason I bring this up is because we had a similar situation in that campaign where our level 3 party was TPK'd, and so was the next party, and the next, and so on. At this point in Carrion crown we are on the forth book and have been through about six full parties, and now none of our characters are even remotely connected to the story which is killing all the roleplaying.
So instead of killing my players I decided to curse each of them with one of the seven deadly sins. Now here is where I need help, how should I implement this in game? What mechanical and roleplay consequences should this have on the characters? Any ideas would be greatly appreciated. Also I apologize if the formatting of this post is terrible, I had to write it on my iPad.