Externally, Nektropos Castle and the Ruins of Varsoon enjoy (if that can be said) the same weather patterns as the regions in which they are located. Internally, the air within these ancient buildings remains charged with the mystic energies of their former owners. Though dark and occasionally damp, they are both remarkably well-preserved.
Flora within these structures is limited to lichens, which form on the stone surfaces on the northern and eastern interior rooms. As the structures are enclosed (or nearly completely underground, as with the Ruins of Varsoon), light is diffused or nonexistent. Fungi grow in organic litter on the lowest floors of these buildings.
Constructed creatures are generally considered part of the "golem" family of creatures, regardless of their outward appearance. However, magical constructs also exist and can include mundane objects such as books or statues that will reanimate only upon being disturbed. That makes travel through the Ruins of Varsoon and Nektropos Castle particularly dangerous, as potentially anything could be a dormant creature.