Act II Key Fieldwork
Use the Scorn helmet to upgrade Eido's Tonic Laboratory in the Last City.
You've delved into the Tomb of Elders to help Eido complete key fieldwork. In defeating more of Fikrul's Revenants, you've managed to salvage tech that Eido believes will upgrade the Tonic Laboratory. Return to the City and install it.
"Your Ghost sent me some data on what you've salvaged! Bring it back to the Last City and we should be able to improve the lab!" —Eido