Field Infirmary
The tub's warm. Don't ask what's in it.
An Iron Teeth healing tub on wheels for after a battle. It treats one troop at a time, 60 health an hour, using a dose of 1 extract and 2 berries. Troops below 90% health within 10 tiles go to it when no enemy is close.
Its crew only pushes it around. Only troops can build it.