Jotun

There are several references in the song that point to a nuclear armageddon theme

The first two verses contain metaphors for nuclear warfare technology.

The first verse makes references to nuclear missile silos "jet-black sinister architecture" installed below ground "where nobody sees". The reference to a sudden appearance could be interpreted as the opening of a well-camouflaged silo that would not be visible to the naked eye or casual observer.

The second verse is a metaphor for a stealth bomber carrying a nuclear payload. The body of black that carries no reflection is the bomber itself. Stealth technology aircraft such as the stealth bomber and fighter are painted jet black to minimize visual detection, but the key aspect of stealth technology is the principle that radar wave reflection is minimized or does not occur due to the shape of the aircraft.

The bomber is "defying it's own room" with "unearthly eggs of de-creation" The eggs of de-creation are the bombs that the stealth bomber carries, somewhat egg-like in shape, these bombs destroy or de-create. The reference to defying its own room refers to the fact that in essence the bomber is destroying the very earth that created the bomber, pilot, and race that created the technology to destroy others and themselves.

The third verse reinforces the nuclear armageddon themes with reference to mushroom-scattered colonies, i.e. the mushroom clouds created from a nuclear explosion. The rising spores of a dying world refer to the nuclear fallout after the explosion, which irradiates the surrounding area to kill what wasnt destroyed in the initial blast with radiation "pollutes and chases away whats left"

The fourth verse is basically a series of metaphors for the destruction of structures or landscapes of global significance, in essence describing what would happen to these landmarks if a nuclear explosion were to occur. "Inverting the fjords" is a particularly good example, as a nuclear detonation would literally cause this to occur (at least temporarily)

I believe the last line of the final verse referring to the "time-bomb encoded in our DNA" is basically saying that the human race has created nuclear technology of it's own volition, and ultimately it may result in the destruction of our own race.