As you guard enemy attacks with Gathering activated, you will gradually accumulate power. After accumulating a certain amount, a "Gathering Burst" action can be triggered, damaging all surrounding enemies and causing additional effects such as a reduction in enemy speed.

When a character's HP falls to zero, that character will be temporarily knocked out and unable to fight. Zael's touch can bring him/her back, though, as long as Gathering is active. But if a character is knocked out 5 times, he/she will be completely removed from battle, unable to be revived until combat has ended.