*Note that any color visible in the pictures is not there. The castle has faded due to age and water damage. It's currently very dull inside and it's hard to saw what designs were there ages ago.
Located north-west of the Clinic and Spa, Fitz's newly made castle is rather hard to miss despite being partially submerged. The castle is it's own little island, with the submerged portion accessible to anyone that may be swimming via a passage way that leads up into a large area that will eventually be a fully functioning lab for him to use.
The upper levels, that are accessible from the outside by a bridge connecting the castle to the mainland, are free from any water damage though there's still a distinct musty smell all around. Algae grows all over the place but other than that it's a fairly decent living space. There are several rooms that Fitz plans to re-purpose into actual living areas and eventually he plans to build some sort of containment unit for meat--just so there's an emergency supply if he should ever forget to leave the lab to eat..which is a thing for him. This will be placed in the kitchen that is a terrible mess at the moment and needs some of the walls fixed up but hey! It's a kitchen.
The bridge will eventually be blocked by a large steel door once Fitz is able to get his hands on one, allowing for the castle to be cut off from outsiders if he so chooses. From the bridge you enter into the courtyard that is overlooked by large windows in the castle itself. (Different from those in the outside view. The ones that castle has are much larger with the panes of glass standing five feet tall from top to bottom.) Access to the two towers at either end of the main gate is from the courtyard with each tower having one large bedroom each with three large windows that overlook the courtyard instead of facing out, giving whoever picks said rooms privacy from prying eyes.
The castle has no electricity so everything is done with torches and wood burning stoves, which Fitz is actually okay with for right now. It may be something he changes later, through Mana, but for now he's content to keep the castle rather low key.
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Sources:
Courtyard view
Hallway View
Kitchen View