We are greeted with the by-now-quite-familiar 'dark ambient drone chant' (a choir of reverberant monk-like voices intoning 'ahhhhhh' in a deep octave), followed by a whistle of feedback to show he means business.  Garbled, obliterated speech chatters repetitiously and without meaning.  Preparing to receive transmissions from the beyond!  It's as if you can hear the gates opening and what begins increasing to pour through...

The semi-tribal sounding drums that enter after a couple minutes are a predictable but welcome edition.  They never draw the focus to themselves enough to hurt the piece's overall originality.  As the track waxes rhythmic, the droning chants from the beginning sink down into a soupy, hollow howl that alternates between sounding like blustering cosmic winds and just a plain old ventilation system.  The drums get louder and become more distorted...  a charming, warm fuzzy, lo fi distortion that isn't really harsh at all.  An androgynous higher voice sometimes seems to call out from beneath it all, and the backwards cries of animals can sometimes be heard.  The density increases, and a lot of individual sounds cease to be audible and the track melds into one harmonically rich sonic mass.  This section is the majority of the piece and continues until about 8 minutes.  Finally, until most of the mix drops out, leaving only an eerie, mulched up drone which periodically drops to demonic lower octaves.  It's an amazing ending, and the most sinister moment here.

So, Matheke makes quite economical use of 11:06, and "Hollowbeast" is a track that's creeped me out more than a couple times (no easy feat) on dark walks home.  With such perfect buildup of tension, this is the most powerfully 'ritualistic' track I've heard in a while, and all without making a single esoteric reference or even taking itself seriously... just look at the name he chose for himself.