Causes terror?
I don't like terror with a General. You're unlikely to want to attach your general to a unit, so you probably wouldn't use it in a game.
I was thinking of something more along the lines of ............. "when a DE character rolls their first blunder s/he is automatically assassinated for their failure. However, such is the fear instilled by Malekith that the next 2 characters you test with have a +1 bonus to Command (only applies if it's on the same turn)"