Guild Wars 2 (The Convergence of Sorrow II Requiem collection) - 11 Historic Boots

After talking to Ely in the Durmand Priory instance, find her again in Hidden Arcana (zone) (Up stairs, down stairs, left past first book bay, then left into storage area) to unlock a new collection: Requiem: Experiment 1, and then complete it by purchasing an item, then interacting with the two nearby objects.