The Infirmary is a new facility introduced in the War of the Chosen expansion. It partially replaces the Advanced Warfare Center, now being the building that increases wound recovery rate of the barracks. This building is also used to help recover from negative traits, a new mechanic introduced in War of the Chosen. These can occur when a soldier takes major wounds during combat. Lastly, this can be upgraded to allow for sending a soldier on a mission despite their condition for emergencies.
Staffing a scientist in this facility improves wound recovery rate by 50% on most difficulties. Note that Infirmary does not passively improve wound recovery rate at all.
Negative Trait Recovery
A soldier can be staffed to this facility for a few days to remove their negative trait. Another, semi-active way of removing traits is unlocked when the Infirmary is built: Sending the affected soldier on missions and returning without injuries sufficiently many times.
This upgrade allows for sending a soldier out on a mission regardless of their current state, but the soldier is then returned to their earlier state upon mission completion. Every revitalization of a soldier costs an Elerium core, each soldier can only be revitalized once per campaign, and only one soldier can be out revitalized at a given time. The option to revitalize is in the squad selection screen when preparing for a mission.