History of Reclaimed Vitality

Reclaimed Vitality is the basic reagent of Episode: Revenant's tonic crafting and is needed for all Tonics.

Acquisition

It drops from slain combatants and destination materials anywhere, more often in Revenant activities (KeenGamer). While Ether Siphon is active, kills have a chance to drop it, and rapid kills trigger Ether Siphon (ScreenRant search summary). Eido's Fieldwork also gives it; the Blood Drive Fieldwork adds a chance at an Uncommon reagent.

Reputation

Each point earned grants Apothecary Eido reputation per equipped Shadestalker armor piece (up to four), which leads to Revenant Engrams.