The band’s frontman Sebastian Fox has stated that “Hex” is a song which is another breakup song off of Mt. Wolf’s Aetherlight and its narrative revolves around the idea of “escaping someone’s spell”.
By definition, hex is a magical spell/curse.
Sebastian in an interview with The Line Of Best Fit:
...
Embrace the cold
Embrace my heart
Our love grown old
At least for each and one point
Oho, white skin to me
Now I stay
It will be hard to break for me
It will be hard to break for you
Pick up your skin from mine
Pick up your skin from mine
Time, one last time
Time won't feel it's coming
It will be hard to break for me
It will be hard to break for you
Pick up your skin from mine
Pick up your skin from mine
It will be hard to break for me
It will be hard to break for you
Pick up your skin from mine
Pick up your skin from mine