Heartguard

The Heartguard is an accessory found in Kingdom Hearts and Kingdom Hearts Final Mix.

Kingdom Hearts
Heartguard can be synthesized once the third synthesis list is unlocked.
 * 3 Spirit Shard
 * 3 Power Shard
 * 1 Power Crystal

Kingdom Hearts Final Mix
Heartguard can be synthesized once the fourth synthesis list is unlocked.
 * 3 Lucid Gem
 * 1 Lucid Crystal
 * 1 Bright Crystal