Dark? Kinda. Powerful? No.
Sounds...familiar.
Can't put my finger on it, but I believe ive heard a similar beat before.
You have portrayed your darkness too lightly here...this beat is not as powerful as you make it sound. Not enough bass (at +10 on my system) to rattle my windows.
The over all beat is great, but needs more Oomph.
That is all.