Chaos Zero Nightmare Fei Banner Pull and Team Build Guide

Pull Fei on her Chaos Zero Nightmare rate-up banner only if your account lacks a dedicated Passion-attribute single-target Striker and you already own the support shell required to fuel her. Fei functions as a high-ceiling burst carry who converts continuous action chains into exponential damage scaling. However, she is not a standalone plug-and-play carry. If you play on a strict summon currency budget or already have invested burst carries, skip this banner to save resources for universal supports.

If you obtain Fei, your immediate priority is building an Action Point (AP) generation engine around her. She cannot function efficiently without teammates who cycle cards and feed her extra actions.

Banner Pull Decision

Evaluate your current roster and summon budget before committing resources to Fei's banner:

Core Support Team Composition

Fei requires a hypercarry shell where two supporting allies focus entirely on generating AP, drawing cards, and softening enemy targets. Do not run a secondary damage dealer alongside Fei; splitting AP between two offensive units starves her combo rotations.

Primary Engine: Mika

Mika serves as Fei’s core support partner. Her kit provides essential low-cost card draw, sustained AP generation, and shielding. By absorbing incoming damage and handling defensive requirements, Mika allows Fei to remove defensive filler from her personal card rotation and spend AP purely on attack chains.

Secondary Buffer or Debuffer

Use the third team slot for an offensive amplifier based on the encounter's mechanics:

• Nia: Best for maximizing burst damage. Nia provides vulnerability debuffs, direct damage amplification, and supplemental AP recovery to align with Fei’s burst windows.
• Beryl: Best for utility and encounter control. Beryl grants team-wide attack buffs and crowd control to break enemy barriers or interrupt boss mechanics.

Support Gear and Partner Card Priorities

Fei’s supports must be built to enable team tempo rather than personal damage:

• Speed Tuning: Ensure both supports have higher Speed than Fei. Debuffs and AP generation must resolve before Fei takes her turn so she can spend her AP budget on pre-buffed targets.
• Defensive Main Stats: Prioritize flat HP and DEF% on support equipment to guarantee survivability without spending AP on emergency healing.
• Partner Cards: Equip supports with Partner Cards that provide team-wide stat auras, starting AP bonuses, or bonus card draws upon playing a skill. These cards eliminate slow opening setups and let Fei begin chaining attacks by turn one or two.

Deck Thinning and Epiphany Choices

During stage exploration and progression runs, keep Fei's support decks as lean as possible. Diluted support decks lead to dead hands that stall her offense.

1. Remove Basic Attacks: Delete generic strike cards from both supports at the earliest opportunity. Every card drawn from a support must produce AP, cycle cards, or apply damage amplification.
2. Prioritize 0-Cost and Draw Skills: Retain and duplicate support cards that either cost 0 AP or draw an additional card when played.
3. Select AP-Positive Epiphanies: When upgrading support cards at Epiphany nodes, select morphs that grant bonus AP on play or reduce activation costs to zero.
4. Extend Vulnerability: For debuffers like Nia, choose Epiphanies that extend debuff durations so Fei's offensive stance remains amplified across consecutive turns.
5. Upgrade Defensive Cards to 0-Cost: Ensure any retained shields or cleansing skills carry zero-cost or retain properties so protecting the team does not cut into Fei’s attack budget.