Eryth Sea/Night (エルト海／夜, Eruyt Sea / Night) is a Field Track in Xenoblade Chronicles, composed and arranged by Manami Kiyota. It is track 21 of disc 3 from the Xenoblade Original Soundtrack. This song is heard at night in Eryth Sea.
This reused in Future Connected, where it plays at night at Soltnar Seal Island on the Bionis' Shoulder.