Ravenwing Skull

Ravenwing Skull is a in Xenoblade Chronicles 2. It can be found anytime on a small island at Xataris Spring in the Central Plain of Temperantia, appearing after approaching said island. Defeating it will unlock the fifth level of Gorg's Bittersweet Dreams, the fifth level of Obrona's Cruel World Special and the fifth level of Zenobia's Wind Mastery.