A greatsword decorated in gold. Legend has it that it was the favored weapon of a certain exalted Harmost back in the distant past.

R1: Day and Night in Counterpoint

Every 10s, the equipping character plays a "Harmonic Movement" of the corresponding type for a boost in the following order: +18% ATK > +120 Elemental Mastery > +28% Stellar Glimmer reaction DMG. Each instance of Harmonic Movement lasts 10s. This effect can trigger even when the equipping character is not on the field.
Triggering a Stellar Glimmer reaction will also grant an additional 12-second instance of "Harmonic Movement: Contrapuntal" with the same effects as the Harmonic Movement active when Stellar Glimmer is triggered. This effect stacks with the original Harmonic Movement effect, and can trigger once every 12s.

R2: Day and Night in Counterpoint

Every 10s, the equipping character plays a "Harmonic Movement" of the corresponding type for a boost in the following order: +22.5% ATK > +150 Elemental Mastery > +35% Stellar Glimmer reaction DMG. Each instance of Harmonic Movement lasts 10s. This effect can trigger even when the equipping character is not on the field.
Triggering a Stellar Glimmer reaction will also grant an additional 12-second instance of "Harmonic Movement: Contrapuntal" with the same effects as the Harmonic Movement active when Stellar Glimmer is triggered. This effect stacks with the original Harmonic Movement effect, and can trigger once every 12s.

R3: Day and Night in Counterpoint

Every 10s, the equipping character plays a "Harmonic Movement" of the corresponding type for a boost in the following order: +27% ATK > +180 Elemental Mastery > +42% Stellar Glimmer reaction DMG. Each instance of Harmonic Movement lasts 10s. This effect can trigger even when the equipping character is not on the field.
Triggering a Stellar Glimmer reaction will also grant an additional 12-second instance of "Harmonic Movement: Contrapuntal" with the same effects as the Harmonic Movement active when Stellar Glimmer is triggered. This effect stacks with the original Harmonic Movement effect, and can trigger once every 12s.

R4: Day and Night in Counterpoint

Every 10s, the equipping character plays a "Harmonic Movement" of the corresponding type for a boost in the following order: +31.5% ATK > +210 Elemental Mastery > +49% Stellar Glimmer reaction DMG. Each instance of Harmonic Movement lasts 10s. This effect can trigger even when the equipping character is not on the field.
Triggering a Stellar Glimmer reaction will also grant an additional 12-second instance of "Harmonic Movement: Contrapuntal" with the same effects as the Harmonic Movement active when Stellar Glimmer is triggered. This effect stacks with the original Harmonic Movement effect, and can trigger once every 12s.

R5: Day and Night in Counterpoint

Every 10s, the equipping character plays a "Harmonic Movement" of the corresponding type for a boost in the following order: +36% ATK > +240 Elemental Mastery > +56% Stellar Glimmer reaction DMG. Each instance of Harmonic Movement lasts 10s. This effect can trigger even when the equipping character is not on the field.
Triggering a Stellar Glimmer reaction will also grant an additional 12-second instance of "Harmonic Movement: Contrapuntal" with the same effects as the Harmonic Movement active when Stellar Glimmer is triggered. This effect stacks with the original Harmonic Movement effect, and can trigger once every 12s.