It's a very special song for me personally, as it takes you on a deep journey into space and it kind of works like a sci-fi symphony.
It is based on a Ridley Scotts Alien franchise, hence the name of the song Xenomorph (alien creature). The song drives you through different emotions, such as creation, destruction, desire to know your place in the universe etc.
The song was 5 years in the making, so I consider this piece as a personal milestone.