She requests something to write with and paper, then starts to draw a large, fairly clear diagram. "The Ice Court is modeled after the rings of a great ash tree, with walls, moats, and pathways forming perfect circles as seen from the air, centered on the palace - the heart of the tree. It's built on a natural bluff overlooking the harbor at Djerholm, and the outermost complete ring encompasses the stations for artillery along the top of the cliff. The artillery has a high rate of fire, and the accuracy is better than anything Ravka's fielded in the last decade, but the range is limited. It's designed to destroy enemy armadas actively blockading the harbor."
"That circle continues into an earthwork wall, with a moat carved in front of it - it's dry normally but has flash floods in the spring and summer. There's not much in the way of ravelins or bastions; the curtain wall can't be modified by modern craft and there's religious prohibitions on disturbing the forest. On the other hand, the forest is dense enough you can only get modern artillery up the main road; there's a few ravelins designed specifically to fire along that road."
"The first major wall is the curtain wall. It's thirty feet wide at the base, with a sheer and smooth outer edge. The inner edge is terraced, though each step is narrow. It's built of rammed earth encased in - what everyone will call natural marble, but it doesn't behave like marble. It's too resistant to impact. The upper ledge is fifteen feet wide, with a few wider platforms when needed for artillery." She indicates the locations of these. "The marble outer edge also extends upwards to about waist height, with taller crenellations and a roof made of what's definitely grisha-forged 'glass' to protect from ballistic shots. The roof was added about a century ago, and it's weaker to impact than the marble, but better than any natural material."
"Behind the curtain wall is a clear stretch, wide enough to move two wagons abreast. After that is a secondary wall and then the out buildings - also constructed to follow their own rings. This section is split into thirds: the Prison Sector, the Drüskelle Sector, and the Embassy Sector. They're entirely separate from each other, with thick walls between them. You have to exit entirely - either all the way out past the curtain wall or all the way in to the ice moat - and enter through another gate to move between them. There's three gates in the curtain wall for the three sectors, and only one is ever open at a time. Every gate has at least two guards at every time."
"There's then a third wall, before the ice moat, which circles the White Palace. The White Palace has its own curtain wall, which is just as formidable as the outer wall."
"There's no secret passages, no other entries than the formal outer gates, and all stretches of the curtain walls are lit at the base and watched at all times. The wall guards work in pairs, with staggered shifts - so there's no single time when all the guards are changing shift."
"You won't be sneaking in. If you want to get in without a massive army - you're going to need deception or else treachery from within."