Enotria: The Last Song’s entire playstyle revolves around swapping between Masks and taking advantage of their different abilities and effects. Your build will be largely dependent on the Mask you’re wearing, and to have the best chance at unraveling the world of Enotria, you’ll need to collect them all.
You start your journey as a Maskless, but early into the game, you’ll be given the Mask of Change and Piercing Wit Masks. The rest of the Masks are acquired by either collecting shards dropped by enemies or by defeating bosses. Many of them also come with stat requirements, meaning you’ll have to level up your character using Memoria before you can even equip them.