Winter's Heavy Heart

The equipping character gains "Silver-Tinged Blood Pact": The equipping character's Elemental Mastery is increased by 24/30/36/42/48 for every Cryo character present in the party. For every Electro character present in the party, the equipping character's ATK is increased by 4.8%/6%/7.2%/8.4%/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 20/25/30/35/40 -point Elemental Mastery boost and deals 6%/7.5%/9%/10.5%/12% increased Stellar Glimmer reaction DMG.