The walls at the treeline are 50' (with the trees cleared 100' from the walls, much to the Druid's pain).
AT the gatehouses, the walls are nearly 80' high.
The walls are constructed of stone.
The two walls are generally about 500' apart.
The southern gate is usually open, while the northern is usually closed.
The PC's will be allowed to enter the southern gate, but once within, will be surrounded by Druids (mostly apprentices and low level), until the gate commander, Arlen Brieg, Druid 6th level, comes to see the PC's.
There are about 16 low-level druids on the south gate, and about 20 on the north gate (plus the commander, and his second in command).
He will not let them pass north, warning them that the Wood Elves, Centaurs, and Northrons are all causing trouble just before the winter settles in. If they want to pass, they need to either provide an animal (or person) for sacrifice at tonight's ceremony. If they do not have something like that to offer, then they will need to join the Druids at the bonfire (in the center of the walls, just to the west of the road), and participate in the ceremony, including drinking the ceremonial drink (a lttle bit of the blood of all those participating).
Gate Head Druid – Sean Draoi (old druid) – about 60 years old – Level 9
Second in command – Abhainn Iníon (river daughter) – about 50 years old – Level 5
There are about 16 low-level druids on the south gate, and about 20 on the north gate (plus the commander, and his second in command).