[b]Limited Light[/b] - You have a set number of times between you and your team mates of how many times you can all be revived.
[b]Best Friends Forever[/b] - You must remain within a certain distance of your team mates at all times or risk being lost to the darkness forever!!
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I was actually just thinking of your B.F.F modifier earlier. I think it would be really interesting. You could also do it in reverse where you have to stay a certain distance apart or you start draining health.