This song was inspired heavily by old north-german songs ive listened to back when I was little and features a similar chord progression and melody. It’s supposed to evoke feelings of longing (called “Sehnsucht” in german).
“Aeviternal Sky” means a neverending / eternal sky and referrs to the aurora borealis which you can see in the northern parts of europe. Starting this year, the northern lights are also way stronger than normal.