I stumbled across it a year or two ago, basically its a sub sub sub genre of hardcore. Tempo usually is over 200 bpm and the emphasis is on the distorted kick drum beat along with dark rolling rock guitar riffs and horror movie sounds.

If anyone has heard it what do you think? Im struggling to find others that do like it

I'm not sure to be honest.

I have a few tracks in my collection by the likes of Rotterdam Terror Corps, Angerfist and Loftgroover, but aren't they just hardcore and or gabber?

I guess so but Terrorcore's BPM is off the charts! it can range from 200 bpm up to 700.... from 700 upwards its Extratone or Splittercore.

Angerfist are great! I recommend Bonehead as well