RDC - It appears a massive tower that looks like a strange fusion between a radio tower and some sort of mad science fortress, standing up on three tall struts connected by various supports, but having various strange, blocky mechanical buildings of some sort sticking out the sides in random places and of random, chunky shapes and sizes, often with strange devices connected and bizarre lights and windows aplenty throughout, and are connected to similar buildings on the ground far away from the main tower by various trams and pulleys - which of course connect from individual buildings to  other individual buildings across the tower, until it finally reaches the top of the tower itself - which takes the form of a massive, somewhat "puck" shaped building with various smaller outcropping buildings along its sides, as well as various massive smokestacks, antennae, and smaller towers emerging from the top, culminating in a massive rod which rises into the sky and ends in a huge tesla coil full of bizarre, crackling energy, several black portions of which create a Lucia symbol. The interiors of the various buildings throughout are extremely industrial and rife with bizarre science, with crackling tubes, assembly lines producing RDAs, tesla coils, faraday cages, clicking counters, interior smokestacks, massive walls covered in buttons you probably shouldn't press, and more, and various experimental chambers regularly produces RDMs throughout, in addition to defense systems such as guard RDAs, defense turrets, security measures such as automatically locking rooms, and more. The topmost building trades out extremely industrial areas for slightly more stylistic areas and even some extremely unusual rooms, such as artificial habitats similar to real world environments, entire captured, ruined cities for testing, rooms which take the form of endless black and purple grids of RD, and rooms which are just infinite white voids where automatically generated puzzles need to be solved before you can continue further. There is a massive Reality Decay Reactor (RDR) at the center of this facility - the one which powers the tesla coil above, which if destroyed will take the entire building with it after a delay, and there are multiple facilities to create boss-type RDMs and RDAs throughout. There is a docking section along the sides of the topmost building with similarly industrial and scientific appearances - very hostile to human life!