Whoever had built the lab wasn't one for furnishing it. Every corridor was identical on every floor. The ground and the walls were constructed with a honey hued mix of stone and soil while the importance of every door could be determined by their silver-wood ratio.
Silver was the best mana conductor, making it possible to store and amplify all the spells it was enchanted with. The corridors were wide, but offered no cover to move stealthily. Lith had to rely on Life Vision to spot his enemies from around the corners and kill them quickly after conjuring a silence zone.
All of them wore fine clothes with a faint magical aura, yet it wasn't enough to explain how they could be so spotless and in mint condition after being allegedly worn by prisoners for years.