A church, clinic, sanctuary, revive pool, or House of Life, is a means of reviving party members in the first three Final Fantasy games. Reviving characters in a church usually costs a small fee. Later, Phoenix Downs and Raise became the main sources of revival, and so the concept of churches or revive pools were scrapped except as plot devices.
Churches, originally known as clinics in the North American NES release, are found in towns and villages in the world map except Melmond. As the player visits towns farther than Cornelia, the cost of reviving a party member increases.
Sanctuaries appear in most towns and villages in the world map. They appear as unmarked buildings with statues of a goddess inside. Examining the statue will revive all KO'd party members in the party with 1 HP at no cost.
As a likely allusion to the NES generation of games, several of the major cities include chapels. Alexandria's chapel is near the western dock, where moogles Kupo, Stiltzkin, and Artemicion make appearances. The chapel in Lindblum is located in the Business District and is currently undergoing maintenance.
Other locations, such as Gizamaluke's Grotto, Esto Gaza, Conde Petie, and the Cleyra Settlement, seem to be religious centers. There are no house chaplains offering services of game-saving or character revival, but the empty chapel in Alexandria holds the first location where one can use a moogle to save one's game, use a Tent, or begin the Mognet sidequest.
The Church of Saint Adamama Landama in Eastern Thanalan appears a few times in A Realm Reborn main scenario quests.
In Ishgard, players can visit the Saint Reymanaud Cathedral in the Pillars district, though it doesn't serve any gameplay function outside a few side quests. The Vault is also a large cathedral that appears as a dungeon.
Ramza prays in a church in Zeltennia Castle and meets up with his childhood friend Delita, but their conversation is interrupted by Zalmour, tasked by the church to exterminate heretics. A battle takes place outside the church, the battlefield is called Outlying Church.
When a character's HP hits zero, the character is dead. Dead character(s) can be revived with 1 HP at a House of Life as long as they have a heart remaining. Player's can see this by press the Select button to see each character's Heart, but once they have run out of hearts, that character is permanently dead, but the player can recruit a new character at the guild.
A church building, often simply called a church, is used for religious activities, particularly worship services.