'Cultus in Tenebris' is a 4 track EP from German act Ctulu and is considered to be second wave black metal. Upon listening however, it seems a little more progressive than just traditional black metal. The music is definitely black metal throughout but the vocals tend to be more of a mixture with black, death, clean, and chanting all being present. The song structures are pretty predictable and don't really deviate much throughout each track. The production is quite solid throughout but there isn't really much earth shattering on this record.