Azure CATacombs is a reference to the Descent 3 level 'Billy the Cat' and has been heavily inspired by it. Billy the Cat is a good level with a great layout, and Wolfie has managed to match it with the limited means of Descent and even surpass it lighting and texturing wise. The level is a composition of a wide, long stretched cave with a river and pools and hallways and shafts giving the level a very three dimensional structure. On top of it DarkFlameWolf provides a set of custom weapons very much changing the gameplay from the usual formula of aggressively pounding the opponent with everything available to a game of cat and mouse by changing many guns to very slow firing, but extremely deadly weapons.
The XL version of the level has been enhanced by an (inaccessible) underwater area and a few effects where they fit well (mostly sound effects). I have also replaced the low resolution custom textures by high resolution textures, carefully sticking as close to Wolfie's original as possible.