Arknights Endfield Xaihi Build & Analysis

Xaihi is a 5★ Support in Arknights Endfield built around three things: HP Treatment that triggers off Final Strikes, consistent Cryo stacking through her crystal loop, and team-wide Amplification. If your Cryo team wants to feel like a team instead of four people pressing buttons, she’s usually the reason it becomes coherent.

If you are comparing Xaihi to other operators or trying to understand where she stands in the broader meta, this article is written to slot directly into our Arknights Endfield Tier List, where all characters are evaluated under the same conditions and assumptions.

Basic Information

Weapon: Arts Unit
Role: Support
Element: Cryo
Rarity: 5★
Main Attribute: Will
Secondary Attribute: Intellect

Base Stats

Stat	Base	Max
HP	500	5495
ATK	30	291
DEF	0	0
Strength	9	89
Agility	9	91
Intellect	15	127
Will	15	150

Skills

Basic Attack — Cooldown

Up to 5 attack sequences dealing Cryo DMG
Final Strike deals 15 Stagger when Xaihi is the controlled operator
Mid-air basic attacks become Dive Attacks, dealing Cryo DMG in an area
Attacking a Staggered enemy triggers a Finisher, dealing heavy Cryo DMG and restoring SP

Battle Skill — Distributed DoS

Summons an Auxiliary Crystal that orbits the controlled operator for a while
After the controlled operator performs a Final Strike, the Crystal restores that operator’s HP (triggers 2 times)
Will increases the amount of HP Treatment
If the target is already at Max HP when the heal triggers: grants a temporary Arts Amp (cannot stack)
SP Cost: 100

Combo Skill — Stress Testing

Trigger

When the Auxiliary Crystal uses up its HP treatments

Effect

Charges and launches the Auxiliary Crystal to deal Cryo DMG
Applies Cryo Infliction

Ultimate — Stack Overflow

Applies temporary Cryo Amp and Nature Amp to the entire team
Intellect increases the Amp effect
Ultimate Energy Cost: 80

Talents

Execute Process

Promotion I: Stress Testing improved — hitting an enemy with Cryo Infliction or Solidification also causes the enemy to take Cryo DMG Dealt +7% for 5s (cannot stack)
Promotion II: Cryo DMG Dealt +10% for 5s (cannot stack)

Freeze Protocol

Promotion III: Stack Overflow improved — also dispels Cryo Infliction and Solidification from the entire team

Potentials

Potential I: Arts Amp granted by the Auxiliary Crystal is increased by another 5%
Potential II: Stack Overflow improved — Ultimate Energy cost −10%
Potential III: Stress Testing improved — hit chains to 1 additional nearby target
Potential IV: Intellect +15, Treatment Efficiency +10%
Potential V: Stack Overflow improved — Amp effect increased to 1.1×

Promotions, Materials, and Bonuses

Promotion Materials

Promotion I

Protodisk ×8
Pink Bolete ×3
T-Creds ×1600

Promotion II

Protodisk ×25
Red Bolete ×5
T-Creds ×6500

Promotion III

Protoset ×40
Ruby Bolete ×5
T-Creds ×25000

Promotion IV

Protoset ×75
D96 Steel Sample 4 ×56
Bloodcap ×8
T-Creds ×225000

Attribute Bonuses

Promotion I: Will +10
Promotion II: Will +15
Promotion III: Will +15
Promotion IV: Will +20

AIC Skills

Promotion I: Manufacturing Cabin operator EXP material production efficiency +10%
Promotion II: Reception Room Clue 5 Rate-UP: Cabal of Tranquility (small)
Promotion III: Manufacturing Cabin operator EXP material production efficiency +20%
Promotion IV: Reception Room Clue 5 Rate-UP: Cabal of Tranquility

Analysis & Verdict

Xaihi’s kit is built around a predictable loop. Distributed DoS creates the Auxiliary Crystal and gives you two HP Treatment triggers tied to Final Strikes. That alone already changes how a fight feels: you are not waiting for a “heal moment,” you’re playing normally and the heal happens as a consequence of the rotation. If the controlled operator is already full HP when the Crystal triggers, the kit flips into value mode and grants Arts Amp instead. That makes her healing not only defensive, but also a way to turn clean execution into extra damage.

Stress Testing is the second half of the loop. It only becomes available after the Crystal uses up its two heals, and then it turns into a Cryo hit that also applies Cryo Infliction. In practice, this is why she is a core Cryo support: she heals while the fight is messy, and once the Crystal is exhausted she converts that cycle into stacking and damage support.

Stack Overflow is the “team switch.” It applies Cryo Amp and Nature Amp to the entire team, with Intellect scaling the strength of the buff. That is the clean multiplier a Cryo team needs because it does not care who is currently controlled or who is landing the hits. You press it and the whole rotation becomes bigger.

Her weakness is also visible in the kit text: Stress Testing is delayed by design. You do not trigger it instantly on demand; you must spend the two heal charges first. That means if you need immediate Cryo Infliction right now, you may be one cycle late. Xaihi is “always useful,” but not always instant.

Still, the reason players call her mandatory is simple. She heals without breaking rotation, she provides Cryo stacking through the crystal cycle, and she delivers team-wide Amp that scales your entire lineup. If you want a Cryo team to feel stable, Xaihi is usually the stabilizer.

Xaihi Build

Under Construction

Xaihi Teams