Key of Khaj-Nisut (5★)

HP increased by 20%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.12% of their Max HP. This effect can trigger once every 0.3s. Max 3 stacks. When this effect gains 3 stacks, or when the third stack's duration is refreshed, the Elemental Mastery of all nearby party members will be increased by 0.2% of the equipping character's max HP for 20s.