From The Black Death Catacombs Quiddity Seed quest introduced in the Recollections event.

Elysa's Phantasmal Arrow
Value: 0
5 Burden Units
This arrow has a small amount of a white substance dotting its tip. You cannot shoot this arrow - it will not nock in any bow, nor can you throw it away.


Special Properties: Attuned, Bonded

Notes

You bring the two gems into proximity. They both give off a small pop and vanish in clouds of purple mist. The mist coalesces into a ghostly arrow tipped with a small dab of black goo.