This soothing yet menacing number comes from “FairyTale”, one of many albums by Zero Project which tell a story starting from the first track and ending at the last. I highly recommend giving them each a listen. If I might geek out a bit, they take the artistic convention of non-diegetic music and run to the moon with it. With each track, you really feel the scale of the story expanding and the intensity and tone of the action swings and bends with the motions of the songs.
You can find all of Zero Project’s albums on Jamendo.