D & D 5e: Waterdeep Dragon Heist, New Player Campaign

The Dragons have been found, but Raener gave most of the treasure back to the city. The players have traced some necromancy goings on back to a place in the South Ward called Kolat Towers and might have figured out how to get inside past the force field. Where is the third tower the warlock mentioned?

Players are now at level 6.

This campaign is wrapping up with 1-3 sessions remaining. We are discussing options for the next campaign.