I've been watching plenty of movies recently, and whenever the "bad" guys kill a "good" guy, it happens while there is sad music playing. Heroes from the "good" side always seem to be invulnerable as long a there is no blurry slow-motion picture with a sentimental background-sound.
To represent this in
40k I came up with a nice fun-rule:
The "Sad music rule":
If you are playing one of the following "bad" fractions, then you can declare sad violin-muic:
Orks, Necrons, Tyranids,
CSM, Chaosdeamons and Dark Eldar
Sad Music may only be declared against a "good" fraction, wich has to be either Tau, Eldar, or any Imperial Army.
It is declared in the shooting phase of the bad player and allows him or her to pick out one of his/her models, wich will attempt to kill a good hero. This model is then allowed to reroll (to hit and to wound) all its attacs directed against a good
IC either in the shooting phase or in
cc. Additionally, the
IC mut reroll all sucessive saves it takes. If used in the shooting phase, the
IC may be treated as an independent unit for the purposes of shooting at it with the choosen model. The attacs directed against the hero may not be instant-killing, and if they are they do not gain any rerolls. This represents the fact that good heroes never get blown apart, but rather die from a hit in the stomach while saying wise things to their companions. If the sad muisc attac suceeds in killing the
IC, then the rest of the good army will gain the
USR "preferred enemy" for one turn, and any unit joined to the
IC will keep this rule until the end of the game. In this case, sad muisic will tart playing

. If the Sad music attac fails in removing the
IC, the chosen evil model will be removed as a casuality because he miraculously gets killed by a lucky hit right before the attempt. If it would only manage to cause a wound on the
IC, the wound will not removed, for sad music only olays when a hero gets killed. The chosen evil model is also removed in this case.
I'd like to hear what you think of this fun-rule, and how you would improve it.