The tower is the largest section of the castle. It contains an observatory for nighttime scouting, but is also used by the wise men to study the stars. Armed guardsmen are always to be found keeping watch.
Watchtower, Outside Tower
wise men
watchmen
It's your watch, sire. I did my shift. Mind the ramparts in this rain, they are bloody slippery!
Come to watch the stars, have you?  Yes, we've been noticing some alignments in the stars lately I'm glad you are finding this exciting. It is boring staring at the ground all night.  Yes, it might be really boring for someone who doesn't understand the alignments What is so special about the alignments?  It can b used to predict occurrences in the future, from weather to real live events What can you predict based on what you see tonight? Anything interesting?  The king is planning to travel by sea in 3days time, and we need to be sure the weather will be favoured favourable Let's hope the stars are in his favor then! Yes, we hope and pray. Although so far we've not seen anything what raising eyebrows over I wish I had the knowledge to predict the future based on stars. It seems like a very useful talent.  You can actually, you just need to be disciplined and ready to learn