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Your goal as an infiltrator is to kill the host. If you are killed, or the host reaches the area boss, you will be sent back to your world unrewarded. The Silencing Blank can be used to return to your own world though will also result in no rewards. Bell Ringers will appear to a host of level 30 and above with at least one summoned ally. A Bell Ringer can summon only one infiltrator at a time and will cease summoning until the current infiltrator has returned to their world. Once there's a Bell Ringer in your world, other players will be summoned to fight against you. Usually you need to have a co-op player with you for the Bell Ringer to appear somewhere in the area, but in Nightmare Frontier and Nightmare of Mensis they will always appear when you're online, so entering these areas makes PvP very likely.