Instructions
Go to any healer in the different cities and towns in the game. Go to the nearest town and speak with the healer if you lose any of your party members in battle. He will ask what services you require. Tell him you need him to revive your party member and he will do so for a fee.
Use Water of Life items. You can find these in chests scattered throughout the world or purchase them from most shops for 3,000 gold. Water of Life can be used in or out of battle to revive fallen party members.
Use healing Psynergy spells to revive downed party members. The Squire, Miko, Savage, Shaman, Scrapper, Medium and Crusader classes all have the ability to learn Revive at some point during their careers. The spell costs 15 PP per use.
Summon Djinni. Some Djinni have the ability to revive downed party members when summoned. Djinni Quartz, Teardrop, Cinder, Glow, Tinder, Spark and Jolt all have this ability.