There isn’t a dedicated exotic quest for the Worldline Zero like the Sleeper. And you’ll need to find the cache that contains the Wordline Zero as well. There you’ll find a large cache in the corner of a room, where you can unlock the sword with 35 memories. The other cache is hidden in the Olympus Descent south of Glacial Drift, which will need 45 memories for the exotic sparrow. For that, I’m going to turn to Destiny guru Datto who naturally, had a full guide up to all 45 memories on day one of the DLC being out.

Source: Forbes May 14, 2018 15:00 UTC