zenless zone zero
Tutorial Observation Data 1
Scattered throughout the Hollows, you'll find crucial materials known as "Observation Data."
Each commissioned Hollow contains 3 sets of Observation Data.
Collecting these data sets increases the final rating of your commission and rewards you with additional Polychromes.

Observation data in the Hollow will be saved once picked up.
You don't need to pick it up again when exploring the same area.