One should be aware that what a lot of people today call Dark Metal has nothing to do with Destiny, who actually coined the phrase way back then. However, Destiny's original form of Dark Metal shares the lack of connection to any kind of occultism with what's presently called Dark Metal. So no, there are no crosses turned upside down, no wily lyrical backward messages, nothing supernatural.
Dark Metal, the way Destiny always figured it, bestows on its audience a feeling. Or a sensation, if you will. Dark Metal communicates a vision of a fateful, grim universe. The same kind of force that abides in the deepest parts of the oceans or the splendid halls where the mountain king ruled before the reckoning of time. The same force that mercilessly comes over us during the endless nights of winter and makes us feel petty and insignificant.