The between-run sanctuary is Sanctus Clypeus, the Divine Shield. Official materials identify Gallant, Mereda, Lotte and Gajov as key allies supporting quests, Boons, supplies and gear.
Sanctus Clypeus
The Church is the between-mission sanctuary known as Sanctus Clypeus, the Divine Shield. Gallant, Mereda, Lotte and Gajov support quests, Boons, supplies and gear.
Returning is not finishing
Visiting the Church between Ward missions does not close the current run. That distinction explains why some preparation options remain unavailable.
Verification note
Official sources define intended behavior. Community timing and bug reports are labelled separately and can change after patches.