HOL Ravenclaw

Since Sandmen are at least partly made of sand, I think they might have a sand fortress nearby, draw or describe this sand fortress in 50 words or more. Does it have a moat? How many sentries are there, where are they posted? Are there any towers? How defensible is it? Does it have any visible weaknesses?

Due December 31, 2020 at 11:59 pm HOL time.

The castle is a sandcastle with a crystal clear blue mote around it. The moat had one small bridge to get across to and a sentry is guarding it at the castle entrance. On the castle is a large door that swings down like a drawbridge to let sandmen in and out of the castle. There are two towers to keep watch from at opposite corners of the tower.

The sandmen are rather clever, and have partially hidden their fortress within a natural fortress of granite boulders and backed into a shallow cave in the hugeness of the granite rock. That way no one can approach them from the rear and prevailing winds would have a lesser chance of blowing away the structure of their walls.
No moat is needed, but they do have some deadfalls located here and there. The entrance is of a narrow space between huge granite boulders. Mostly the 'castle' is of one floor, with only a couple of higher turrets sticking up at either side of the entry to watch out for intruders.