What is the fine-grained topic of the following text: Compared to their latest full-length release – “Pangaea”, 2016 – characterized by long tracks and a progressive black metal approach, ECFERUS’ new material is concise, definitely more violent and brutal, and perfectly tuned with a concept dealing with madness and apocalyptic omens. Only return the topic.
ECFERUS' new music material and its differences from their previous album "Pangaea".