Party-composition catalyst for Cryo, Electro, or Stellar Glimmer
Released Sep 23, 2026
Winter's Heavy Heart grants its wielder bonuses based on the number of Cryo and Electro characters in the party. In Radiance: Stellar Glimmer, its effect changes to Elemental Mastery and Stellar Glimmer reaction damage per qualifying character. Consider it when the party composition matches the relevant effect.
A catalyst wielder in a party with Cryo and/or Electro characters
A Radiance: Stellar Glimmer setup that can use the alternate stated bonuses
Base party effect
Under Silver-Tinged Blood Pact at R1, each Cryo character in the party gives the wielder 24 Elemental Mastery, while each Electro character gives 4.8% ATK. Up to four Cryo or Electro characters can provide these buffs. The effect therefore counts party members of those types; it is not a per-hit stack.
Radiance: Stellar Glimmer effect
In Radiance: Stellar Glimmer, the effect is changed: each Cryo or Electro character in the party gives the wielder 20 Elemental Mastery and 6% increased Stellar Glimmer reaction damage at R1. Refinement raises these per-character amounts. This is a separate stated mode; do not add it on top of the base Cryo-Elemental-Mastery and Electro-ATK effects.
Investment and comparison
The weapon has CRIT DMG as its secondary stat, and ascension covers six stages. Refinement consumes another copy and Mora, increasing the listed party bonuses. A Thousand Floating Dreams grants effects based on the elemental types of the wielder's other party members and shares Elemental Mastery; Angelos' Heptades depends on shield creation. Their activation conditions differ from this weapon's Cryo/Electro count.
Limitations and tradeoffs
The base effect depends on party members of specific Elemental Types.
Radiance: Stellar Glimmer replaces the base effect rather than supplementing it.
Common mistakes to avoid
Adding the Radiance effect to the base Cryo and Electro bonuses instead of treating it as a replacement.
Counting more than four Cryo or Electro characters toward the listed base cap.
Effects and reference details
Refinement effects
R1 The equipping character gains "Silver-Tinged Blood Pact": The equipping character's Elemental Mastery is increased by 24 for every Cryo character present in the party. For every Electro character present in the party, the equipping character's ATK is increased by 4.8%. Up to 4 Cryo or Electro characters can provide the above buffs.
Radiance: Stellar Glimmer: The effect of Silver-Tinged Blood Pact is changed to: For every Cryo or Electro character present in the party, the equipping character gains a 20-point Elemental Mastery boost and deals 6% increased Stellar Glimmer reaction DMG.
R2 The equipping character gains "Silver-Tinged Blood Pact": The equipping character's Elemental Mastery is increased by 30 for every Cryo character present in the party. For every Electro character present in the party, the equipping character's ATK is increased by 6%. Up to 4 Cryo or Electro characters can provide the above buffs.
Radiance: Stellar Glimmer: The effect of Silver-Tinged Blood Pact is changed to: For every Cryo or Electro character present in the party, the equipping character gains a 25-point Elemental Mastery boost and deals 7.5% increased Stellar Glimmer reaction DMG.
R3 The equipping character gains "Silver-Tinged Blood Pact": The equipping character's Elemental Mastery is increased by 36 for every Cryo character present in the party. For every Electro character present in the party, the equipping character's ATK is increased by 7.2%. Up to 4 Cryo or Electro characters can provide the above buffs.
Radiance: Stellar Glimmer: The effect of Silver-Tinged Blood Pact is changed to: For every Cryo or Electro character present in the party, the equipping character gains a 30-point Elemental Mastery boost and deals 9% increased Stellar Glimmer reaction DMG.
R4 The equipping character gains "Silver-Tinged Blood Pact": The equipping character's Elemental Mastery is increased by 42 for every Cryo character present in the party. For every Electro character present in the party, the equipping character's ATK is increased by 8.4%. Up to 4 Cryo or Electro characters can provide the above buffs.
Radiance: Stellar Glimmer: The effect of Silver-Tinged Blood Pact is changed to: For every Cryo or Electro character present in the party, the equipping character gains a 35-point Elemental Mastery boost and deals 10.5% increased Stellar Glimmer reaction DMG.
R5 The equipping character gains "Silver-Tinged Blood Pact": The equipping character's Elemental Mastery is increased by 48 for every Cryo character present in the party. For every Electro character present in the party, the equipping character's ATK is increased by 9.6%. Up to 4 Cryo or Electro characters can provide the above buffs.
Radiance: Stellar Glimmer: The effect of Silver-Tinged Blood Pact is changed to: For every Cryo or Electro character present in the party, the equipping character gains a 40-point Elemental Mastery boost and deals 12% increased Stellar Glimmer reaction DMG.
