I love the Theremin, and in this track I've fused two Theremin tracks with a trap track plus added bass guitar and drums, some classic dacca GB rock guitar and a little metal guitar towards the end.
One of the Theremin tracks is fed through a guitar amp in AmpKit to provide the deep dark feedback that builds and builds from the start of the track.
It reminds of the scene where the monster from the id attacks the forcefield in the classic 1950s science-fiction film Forbidden Planet.