Murder Kills Count
Every time you kill an innocent player (blue), your murder kills count increase. When your murder kills count is equal or above 5, you become a murderer (red).
Murder Kills Decay
Every 40 hours, you lose a murder kill. However, if you're impatient, you can decrease your murder kills count in exchange of some gold coins. You need to visit an assassin and he/she will remove a murder kill.