Thanks in part to a recent influx of affluence, a new Keep has sprung into being, fueled by the tireless Nexus contractors that create all buildings while no one else is looking. The walls stand at a daunting twenty five feet high, cast from seamless black granite that glitters faintly under the morning sun. These very walls surround an eighty foot wide courtyard on five sides, forming a pentagon of safety over the inhabitants. At each of the five corners sits a squat tower, ten feet higher than the walls it is connected to, from which defenders can protect the flanks of the nearest two towers in a near perfect net of safety. Surmounting the towers are gleaming black adamantine spikes, crafted from the Mithar treasure hoard and used to fly flags bearing the crests of the Therishein and Mithar Houses.
Immediately as you enter through the gates you can see two square, flat-topped granite outbuildings flanking either side of the short road leading up to the keep proper. The right most building holds the forge, where Harnel himself works tirelessly to turn out high quality adamantine arms and armor. The left is his armory, stocked high with the fruits of his labor.
The keep itself retains the outer wall's pentagonal theme, five sides of glittering stone reaching almost fifty five feet in height. It is capped by a flat roof that acts as a flight deck for Harnel to take off from and land on. To this end imposing black spikes have been installed to act as perches, so that he and his future children will have no trouble landing in extreme weather.
In the first apex of the Tower walls from the gate there is a door set deep into the stone. Beyond this door is the ground floor, more specifically the entrance hall where Harnel greets his guests. The room is oddly shaped, a sort of wedge that gets wider towards the exterior walls. Towards the center it converges into three doors, one leading off to the kitchen on the right, and another to the living room on the left. The one in the center leads up a spiral staircase to the next floor, and the ones after that eventually. Also on the first floor is a washroom and Harnel's personal study. All of the rooms are arrayed around the central staircase in the unique wedge shaped pattern.
The second floor is a bit more esoteric, holding only three rooms. On the apex facing the gate is a small space for storing alchemical ingredients and curative potions. The recreational room take up a double sized wedge on the west side, while the east is a room for the safe practice of rituals and other potentially catastrophic magic.
The third is where the family makes its home, including a double sized master bedroom and two guest rooms, one already set aside for the little one on the way. Another bathroom can also be found here, to eliminate the inconvenience of running down two flights of stairs in the middle of the night.
The fourth and final floor was left open and converted into a massive library as Harnel's gift to his lovely Cessie. A place so well stocked with lore, both arcane and mundane, that I'm certain no one could possibly read every tome amongst its shelves. From here the stairs only lead upward to the Aerie, which has been equipped with guard-rails and no slip coatings to ensure that no one takes a nasty tumble to their doom while enjoying the pleasant view.
Because honestly, who builds a tower with roof access and then doesn't install guard-rails? Incompetent contractors, that's who.
Other things of note include the extensive tunnel complex the land was built on, now fully integrated into the design to allow quick access to all of the buildings on sight without exposing the people inside to an enemy siege. These tunnels also join to a rather well built cellar/bomb shelter and Harnel's underground hoard of adamantine bars. An interesting fact: All the metal fixings, including faucets, doorknobs and hinges, were made from this very stash.
The keep is overlooking the city of Inside, on a cliff above. Built into the cliff are natural caverns. Though most have been collapsed, a few, the only entrances remaining leading to the towers themselves. This is where Harnel stores his treasure horde, including the massive stockpile of adamantine.
Keep in mind, the whole place, like so many other locations in the nexus, is dimension locked and warded against scrying.