Waterdeep

The North Tower, also known as the Trolltower, was a fortified structure in Waterdeep that stood at the most northerly tip of the city's Sea Ward and on the western end of the Field Ward. This structure stood four stories tall, had spires, and was directly connected to the Trollwall that separated the two wards. Being a torchtower, North Tower had all the features that were common among them. This included a debriefing room, a small armory, holding cells, storage rooms for the holding of evidence or confiscated items, some bedchambers, and some garderobes. Like all other torchtowers, this structure had three beacon-fires that were constantly kept on standby. North Tower, like all torchtowers, was manned by members of the City Watch. It's possible that the origins of the name "Trolltower" derived from the same place as the Trollwall, which was noted as having originally been constructed primarily for the purpose of holding off attacks from trolls north of Waterdeep.