Refinements:

R1: Sky-Piercing Fang

CRIT Rate increased by 4%. Gains Skypiercing Might upon using an Elemental Burst: Increases Movement SPD by 10%, increases ATK SPD by 10%, and Normal and Charged hits deal additional DMG equal to 20% of ATK. Skypiercing Might lasts for 12s.

R2: Sky-Piercing Fang

CRIT Rate increased by 5%, Gains Skypiercing Might upon using an Elemental Burst: Increases Movement SPD by 10%, increases ATK SPD by 10%, and Normal and Charged hits deal additional DMG equal to 25% of ATK. Skypiercing Might lasts for 12s.

R3: Sky-Piercing Fang

CRIT Rate increased by 6%. Gains Skypiercing Might upon using an Elemental Burst: Increases Movement SPD by 10%, increases ATK SPD by 10%, and Normal and Charged hits deal additional DMG equal to 30% of ATK. Skypiercing Might lasts for 12s.

R4: Sky-Piercing Fang

CRIT Rate increased by 7%. Gains Skypiercing Might upon using an Elemental Burst: Increases Movement SPD by 10%, increases ATK SPD by 10%, and Normal and Charged hits deal additional DMG equal to 35% of ATK. Skypiercing Might lasts for 12s.

R5: Sky-Piercing Fang

CRIT Rate increased by 8%. Gains Skypiercing Might upon using an Elemental Burst: Increases Movement SPD by 10%, increases ATK SPD by 10%, and Normal and Charged hits deal additional DMG equal to 40% of ATK. Skypiercing Might lasts for 12s.

Your support is more valuable than a primogem.