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Strategy Overview

For Phase 1, you need to :

瓦伦塔茵's S3 as much as possible
佑妲 uses S1 only
诺缇亚 must maintain her buff uptime for priority pushes
黛安 needs 佑妲 to have the highest ATK to push her every turn with S1

Phase 1 Sequence

Build CP in P1 and lock boss down using 佑妲 & 瓦伦塔茵's priority reduction.
Do not heal 佑妲; let her self-sap to 1 HP (boosts SPD via Swiftness).
Break boss once, reduce WG to 1 - 2, apply Invulnerable with 佑妲 S3/S2B2.
Ensure boss is around 1.2M HP after breaking with 10 chain attacks ready.
Push P1 damage over threshold → P2 boss spawns.
佑妲 (1 HP, Swiftness) will act before P2 boss.
Swap to Team 2.

Phase 2 Mechanics

P2 boss uses S2 , 单子艾娃 S2 cleanses it immediately.
Cleanse = "healer action", which applies to boss.
Team can outspeed and break + remove core energy.
Spam chain attacks to lock him; use 单子艾娃 S1 to help build CP.

Important Notes

This comp only works with 6★ 单子艾娃. Credit to Birdmouth for discovering this. The core energy buff counts as an additional attack, which 单子艾娃 skill seal at battle start can cancel. This protects your CP from being lost.

Alternative: swap to Team 2 during Phase 1. Since SYS_ELEMENT_NAME_LIGHT SYS_ELEMENT_NAME_LIGHT SYS_ELEMENT_NAME_DARK SYS_ELEMENT_NAME_DARK units can't reduce WG in P1, you'll need at least one SYS_ELEMENT_NAME_FIRE SYS_ELEMENT_NAME_FIRE SYS_ELEMENT_NAME_WATER SYS_ELEMENT_NAME_WATER SYS_ELEMENT_NAME_EARTH SYS_ELEMENT_NAME_EARTH unit in Team 2. This lets 单子艾娃 apply skill seal upon entering P2 and protect your rotation.