Of course it's kinda hard to describe music vividly in words, but here's a general description of their sound as best I remember:
Vocals: Slurred, hyper-angry hollering with (technically speaking) an extreme amount and degree of compression added along with pitch-bend processing which drops the freq. range down into the sub-Darth Vader 30hz range, apparently in pursuit of an unintelligible goth-horror-scary-monster effect.
Percussion: Take a double-bass-pedaled drum kit, work the pedals as fast and hard as your feet can go, and add random-pattern tom rolls, cymbal crashes and hi-hat hits.
Guitar(s): Buy a Gibson Les Paul and a big Marshall quad-stack, learn 2 chords on the former, turn up to 11 the latter, and bash away mostly on the bottom 3 strings in double-time with frantic, spirited feeling absent of skill or coherence.
Bass: Same as guitar, sans chords and minus 2 strings.
IOW, a teen life-sucks-I-hate-everybody-don't-care-about-nothing aggro-band.