Key of Khaj-Nisut

1. R1 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.
2. R2 HP increased by 25%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.15% 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 0.25% of the equipping character's max HP for 20s.
3. R3 HP increased by 30%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.18% 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 0.3% of the equipping character's max HP for 20s.
4. R4 HP increased by 35%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.21% 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 0.35% of the equipping character's max HP for 20s.
5. R5 HP increased by 40%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.24% 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 0.4% of the equipping character's max HP for 20s.

Lore

One of a paired set of scepters fashioned from obsidian. They say that this can be used as a key to open the gate to a paradise that lies at the end of the ocean of sand.