As mentioned earlier in this blog, Djent is a subgenre of metal. It's signature sound is heavily distorted guitars, polyrhythmic drumming and synth keyboards. Definitely a prog rock vibe. Guitarists in this genre employ techniques such as "palm muting" and "chugging". I've been looking for equivalent techniques for the piano / keyboard to use in my dhymn.

For palm muting on the piano I found this example on Reddit. It's a technique commonly used in free jazz by artists such as Cecil Taylor and Paul Bley (here's a great documentary on free jazz).

As for chugging, the closest equivalent sound I can find is the very beginning chords of Tower by Ian Ring. Still looking for other examples.