My proposed method (all conditions must be met): 1) Kills and assists should only be tracked inside darkness zones. 2) kills and assists for each zone summed together with weight (TBD) factored in for kills. IE 10 assists = 1 kill. Call this the score. 3) every player must meet a minimum (relative) score for every darkness zone entered by the group since that player has joined (to account for late arrivals), in order to receive rewards. This can also be used to implement a better reward system or incentive to kill everything, ie using score from previous darkness zones and multiplying it by current xp per kill. Edit: the idea is not to punish "sitters" but to give more incentive to completing the strike as intended. Add in some competitive element between fire team members that affects end rewards/xp gains and it becomes golden. Edit 2: even if you normalize the score based on the lowest score, where the lowest score results in a factor of 1x for xp and rewards, it benefits players that stick through a strike with 1 or more afk members in that his/her reward will be substantially higher than if all 3 players were competing. Obviously some tuning will be needed to balance it as it shouldn't be preferable to solo/duo a strike with 1 or 2 afk members vs all 3 competing.