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Refinements:
R1: Heat Haze at Horizon's End
The equipping character gains 52% of their Elemental Mastery as bonus ATK. When an Elemental Skill hits opponents, the Dream of the Scarlet Sands effect will be gained for 10s: The equipping character will gain 28% of their Elemental Mastery as bonus ATK. Max 3 stacks.
R2: Heat Haze at Horizon's End
The equipping character gains 65% of their Elemental Mastery as bonus ATK. When an Elemental Skill hits opponents, the Dream of the Scarlet Sands effect will be gained for 10s: The equipping character will gain 35% of their Elemental Mastery as bonus ATK. Max 3 stacks.
R3: Heat Haze at Horizon's End
The equipping character gains 78% of their Elemental Mastery as bonus ATK. When an Elemental Skill hits opponents, the Dream of the Scarlet Sands effect will be gained for 10s: The equipping character will gain 42% of their Elemental Mastery as bonus ATK. Max 3 stacks.
R4: Heat Haze at Horizon's End
The equipping character gains 91% of their Elemental Mastery as bonus ATK. When an Elemental Skill hits opponents, the Dream of the Scarlet Sands effect will be gained for 10s: The equipping character will gain 49% of their Elemental Mastery as bonus ATK. Max 3 stacks.
R5: Heat Haze at Horizon's End
The equipping character gains 104% of their Elemental Mastery as bonus ATK. When an Elemental Skill hits opponents, the Dream of the Scarlet Sands effect will be gained for 10s: The equipping character will gain 56% of their Elemental Mastery as bonus ATK. Max 3 stacks.
Your support is more valuable than a primogem.