Mementos (Collection)

Mementos are special collectables items that can be used ulimited times and allows your Vestige to perform special actions. It's obtainable from Quests, Achievements, DLCs, on Holiday Events and in Crown Crates.

Nowadays they can be found in Collections but originaly mementos were item stored in the Vestige inventory as a subset of Trophies. Any mementos deleted were restored when it were tranferred to the Collections interface.