I had an idea loosely based of of a different game:
There are two teams, one player on one (hidden), everyone else on the other (hunters). Teamkilling is on. The hunters are given machine guns and optimally are one-hit kills. The hidden is givena meelee weapon, disguise kit, and loak & dagger. The idea is to find and kill the hidden before he does just that to you. The hidden has human health.