Robbers: Negate and discard is better wording. Add explanation for the end (Divide each hero's abilities by 2, rounded up) etc.
Priest/Levite: I like the idea, but I think one hsould have a different ability.
Widow: Good Idea. I kinda like it, but maybe only protected from opponent's evil characters.
Centurion: Broken. Wayy too good. Tone it down to top 2, maybe even top card.
Lamp: Ehh, I don't like it. Personal preference.