Pitch down vocal samples and add heavy reverb and delay to make them sound like they are far in the background.
Use Omnisphere or ElectraX for dark, ambient bells and chords. Apply a half-time effect (like Gross Beat) to a melodic loop to get that slowed-down, moody feel. free_vkie_x_white_widow_type_beat_100
Use a "Spinz" or "Short" 808 sample. Make sure it is sidechained to the kick. Add slight distortion for punch. Pitch down vocal samples and add heavy reverb