What is the fine-grained topic of the following text: Though the core membership of Witch Vomit also perform surgeries for barbaric persecutors Torture Rack, and the two bands share a propensity for blasting storms of seared flesh chunks and glistening old guts, Witch Vomit is mixing its mashed bone stew with a wider array of viscera, melting brains with ancient violence and intensity.. . Only return the topic.
Witch Vomit Band's Music Style