Darkpsy exists some tracks are:
penta - pentafiles [spectral concepts]
va - tales from the dark forest [stone age]
scatterbrain - infernal angel [digital psionics]
va - radical simplicity [ketuh]
trold - once upon a time [apoxina]
steptime - steptime [stone age]

there is also one called horrorpsy which is pretty full on:
Check out Sandman
xenomorph
Marchaos

Less dark than Xenomorph, but equally twisted and evil:
Kindzadza
Azax Syndrom
Psychotic Micro
Aerodance
Parasense
Neuromotor
Fungus Funk

Mostly anything released on Acidance, DiscoValley and Parvati records is guaranteed to rock the ground beneath you.

the likes of leviathan is quite a rare form of music unfortunatly. when i used to spin hardcore i was very partial to 'cenobite records'. i dont really keep up to date with HC anymore but last thing i heard was leviathan was starting up the cenobite label again and this was about 18 months ago ... did it ever happen?

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Bring it on down son, so you can get done, I got more styles than the miles to the sun,
Ninety three million five thousand flows, and heres one more for the HOoOoOoOOO'S!!!