I think it will be cool to do something like this. It will make rare drops even more rare. So you'll feel like you did something to get that drop and not just be like I killed that boss.
Edit:
So people find this to be really bad so Im going to add to it. Most saying why its bad (like some one can just wait to get the last hit)
If you play L4D then you know at the end of a run it will tell you who did the most damage to the Tank and other boss in that run. Well what about that if you do the most damage on the Boss then you get one more rare drop add to it? Or Xp or anything.
I made this to see what yall can come up with will most of all got mad. Most of it is my fault for not putting "what do yall think and how will you go about doing something like this?" but some got it and went with it and came up with some cool things. Also no reason to get mad I post it to get a conversation going not for you to get mad.
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This is now nominated as one of the top 3 worst ideas #destiny has created. Can you not see how this would be obviously abused...