The Exotic Weapon Bounty with crucible requirements are laughable. Not only are you forced to use one specific damage type, you are also forced to go massively positive every game with those weapons in order to get any progress in them. The death removing progress on the bounty encourages people to quit instead of continuing to play losing games, reducing the enjoyment of everyone else in the game. These steps are absurd when you can easily get an exotic just playing the crucible without the restrictions and doing poorly.
EDIT: Apparently you even lose progress if you die while the game is over and the score screen is being shown. That's absolutely retarded.
[spoiler]"Use Void Damage to defeat Guardians in the Crucible. Death will slow your progress." [/spoiler]
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Just finished this one. I just ran around with nothing but a void shotty and launcher. Had to use my underleveled Voidwalker class as well, but I got it after about 6-7 matches. All I can say is just keep using nothing but void and hopefully you'll finally be successful. I wish you all luck!