Under the Northern Lights (MIDI Arrange) (Ys X: Nordics) 

Original song by Falcom Sound Team jdk/Mitsuo Singa, from Ys X: Nordics
I guess the full name is Under the Northern Lights That Arrived but that doesn't make sense to me so I'm shortening it, the soundtrack disc only has the name in Japanese anyway
Arranged by me in Reason 12, background screenshotted from Ys X's ending screen