When a character dies, you can try to revive them by matching that their blank gems; however that turn will not result in any damage. However, healing gems will refill the respawn counter for a character. Use them to heal other people in the party as well as reviving a downed character.
Complete the following tasks to unlock PlayStation trophy rewards.
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There are 10 Bronze Trophies, 2 Silver Trophies, and 1 Gold Trophy.
Keep the priest upgraded to allow him to keep the other characters alive. Also level up your bomber and gunner to increase their damage. Upgrade the warrior last, as it is only used in limited situations.