I have never heard a "tentacled scream". If this is what they sound like then I am a fan of them. Ritual Chamber appear to be a hidden gem that slipped past me during the already crushing and dark brilliance that was 2013 in DM.
References are appearing comparing them to Grave Miasma (see previous post) which is a fair assessment except there are no sonics for guitar lovers to fap over, this is just straight up atmospheric, gloomy and looming DM nodding heavily to Portal in style.
Head over to Bandcamp to experience Ritual Chamber for the princely sum of $5 (or £3 ish to us Brits).