If an enemy is hit by Fly the Flag, the target’s Ice RES is reduced by 10% for 8s.
The custom-made weapon Oni Banner features a powerful built-in cooling system. Its Ether-infused catalyst generates cold air, dealing significant DMG to enemies it hits.
idk about Promeia synergy, but i plan to use her with Nangong Yu (or Vivian sometimes) and Yuzuha.