History of Key Fieldwork

Overview

Key Fieldwork is the final tier of Fieldwork in each act of Episode: Revenant, after Minor and Major Fieldwork. Open it from Eido's Fieldwork tab in the Last City. It unlocks only once all Major Fieldwork for that act is complete: five in Act I, two in Act II (Tonic Experimentation on Nessus and the Moon).

Act I

A multi-step chain including a visit to Widow's Court and laboratory equipment returned to Eido's lab (per a creator walkthrough).

Act II

Takes place at the Tomb of Elders. Rewards are a Tomb Reaper upgrade and a Medium Tonic Reagent Sack (ProGameTalk).

Notes

Steps are summarized from guides; follow the in-game objectives for exact details.