Curiouser and curiouser!
Very rare1.5%All-the-thingsOptional
Collect all arch-artifacts. A priceless collection, arguably too weird, even by Zone standards.
There are seven unique arch-artifacts which can only be found in arch-anomalies. See the linked map for their locations; hit 'Hide all' then show "Arch Anomaly" under the Locations heading.
Note the Wandering Lights spawns only at night.