The EP MASS//MINUS is the successor of their debut EP VAIN//VOID (2014) and again it shows that DEEM INDEX doesn’t shun from mixing the various styles of metal.

The diversity of styles in metal and their energetic stage performance made it possible for DEEM INDEX to share various venues with amazing national and international bands like Katalsym (CAN), Dew-Scented (D), Inside The Artist's Head (SE), Eyes Wide Open (SE), The Very End (D), Bodyfarm (NL), Blood Red Throne (NO), Distillator (NL), For I Am King (NL), Magnacult (NL), Bring On The Bloodshed (NL) and many others.
It also provided DEEM INDEX the headline slot at The Unborn Fest 2016 on Terceira, Azores, Portugal.

Quotes taken from reviews VAIN//VOID EP:
From the opening track 'Nihility in Equivalence' the melodic riffing of NWOBHM bursts through. The vocal; perfectly capable Death Growls. This whole track has a great, head nodding rhythm to it. 'Pandemonium As A Virtue' has a beautiful, Heavy Metal lead riff. A thrashier pace to the drums at times. Even though the vocal is growled it just isn't sinister sounding music. The beauty of the melody just pipes it down a bit. I have a new name for the style; it's Death Metal for those that don't do Death Metal.
Black Phoenix Rising

“A combination of Heavy metal, Thrash and Melodic metal is what to expect on this EP. The growls can compete with the more well-known Death metal bands, the guitar riffs are solid and most of the time the songs are up-tempo. The first song 'Nihility In Equivalence' opens the EP with a BANG! I could hear some Trivium and Izegrim influences, but rest assured this band has its own style.”
Hellspawn.be

“The five tracks featuring on DEEM INDEX’s EP VAIN // VOID shows that the band has a wide spectrum of influences. Where some critics may say that the band is still looking or can’t make up their mind, you can state that the band is not monotonous and can surprise their listeners.”
White Room Reviews

“So, Deem Index can’t be given one label. If you listen to the EP you get pieces of modern metal, old school heavy and a lot of thrashmetal passages as wel as some electro influences. If that is not enough they also manage to bring in some death metal influences, an interesting mix if you ask me.”
Album Feeds

DEEM INDEX is:
Vocals: Ronald
Guitar: Jelmer
Guitar: Lars
Bass: Leonie
Drums: Elwin