Advice From A Friend (encounter idea)
Here's one for you DM's that want your players to be reminded of the people they helped along the way. The players are traveling about from place to place, when they receive a letter. The letter is from a person they have helped before. The letter talk about how they heard from a friend, who heard from a friend, who heard from a sailor, who heard from a friend, about a curtain thing that might be happening around the players area. At this point the players may have already encountered this thing or have gone to an area just far enough to not have it happen tohem, but in this one it's more of the thought of a person that they helped a awhile ago, trying to do the same to them.