XAIHI BUILD GUIDE: BEST WEAPONS, TEAMS & SKILLS | ARKNIGHTS ENDFIELD
Xaihi has emerged as the SS-Tier enabler for Cryo-Nature compositions in Arknights: Endfield Version 1.2. Affiliated with the Cabal of Tranquility, her operational profile focuses on high-frequency Cryo status application and a unique damage-amplification loop gated by her Intellect attribute.
This guide details the advanced technical nuances of her kit, including hidden mechanics identified through frame-by-frame analysis and community stress tests.
TL;DR - Should You Build Xaihi?
Build her if: You run Cryo-Nature compositions with Yvonne or Last Rite. Her 60% damage amp (at 1200 INT cap) makes her the non-negotiable support for Shatter teams.
Skip if: You primarily run Heat or Physical compositions without Cryo/Nature synergy.
Key verdict: Xaihi is a “Long-Window” enabler—she excels in extended fights where her overhealing trigger can maintain 100% uptime on her Arts Amp buff. Her 2.4-second Final Strike makes her an efficient on-field driver for SP-hungry teams.
Who is Xaihi?
Xaihi serves as a technical enabler within the tactical environment of Talos-II. Her kit transitions between sustain and amplification through a crystal trigger system tied to the controlled operator’s basic attack sequence.
The Overhealing Misconception
A critical point of confusion in Xaihi’s kit is the trigger for her Arts Amplification. While the battle skill description for “Distributed DoS” suggests the target must be at “Max HP,” field testing confirms this is a localization inaccuracy.
The Trigger: The Arts Amp triggers on any amount of overhealing (restoration exceeding 100% of the target’s current HP pool).
Optimization: High investment in the Will attribute or her signature weapon, Freedom to Proselytize, essentially guarantees this trigger on every proc, as the heal values are high enough to overflow the HP bar even if the target has taken minor chip damage.
Pre-Combat SP Optimization
Because her Battle Skill has a duration of 25 seconds and no immediate effect upon casting, technical players utilize a “Pre-Aggro Deployment” strategy.
The Trick: Cast “Distributed DoS” approximately 8 seconds before engaging an enemy.
Impact: This grants the operator a “free” 100 SP rotation. Xaihi enters combat with her Auxiliary Crystal already active, and her SP begins regenerating immediately upon the first engagement, allowing for significantly higher skill uptime.
Fundamental Operational Mechanics
Stress Testing: The Delayed Infliction Bottleneck
Xaihi applies her primary Cryo Infliction through her Combo Skill, Stress Testing. Unlike other supports, this application is gated behind the exhaustion of the crystal’s two healing charges.
Timeline: In a standard rotation, Xaihi is often “one cycle late” for immediate elemental reactions because she requires two Final Strikes to occur first.
Mitigation: This delay makes her less effective in “Quick-Swap” teams and cements her role as a “Long-Window” enabler for high-attack-speed carries like Yvonne.
Frame Data and SP Generation Metrics
Advanced theorycrafting uses a 98-pixel metric to measure SP generation (where a full SP bar is exactly 98 pixels wide).
Final Strike Efficiency: Xaihi possesses one of the fastest basic attack chains in the game. Her Final Strike occurs at 2.4 seconds, significantly faster than the 3.6-second baseline seen in most Greatsword or Caster classes.
SP Recovery: Because SP is primarily recovered on the Final Strike, Xaihi functions as a more efficient on-field “driver” for SP-hungry teams than her Support classification would suggest.
Advanced Scaling Math and Attribute Breakpoints
Xaihi’s effectiveness is bifurcated between sustain (Will) and amplification (Intellect).
The 1200 Intellect Hard Cap
Community stress tests of her Mastery 3 (M3) Ultimate, Stack Overflow, have corrected previous theories regarding her stat caps.
Dynamic Scaling: The “Intellect Raises Amp Limit” refers to the maximum ceiling of her buff. While early assessments suggested a 400 INT cap, M3 testing identifies a linear progression up to 1200 Intellect.
Ceiling Values: At 1200 INT, the Ultimate provides a 60% damage increase to Cryo and Nature elements.
P5 Multiplier: If Xaihi reaches Potential 5, her Ultimate potency is multiplied by 1.1×, raising the theoretical ceiling to a 66% damage increase.
Current Max: With Level 90 gear, the highest attainable Intellect is approximately 705 INT, resulting in a ~45% amp in practical builds.
Equipment Optimization: Debuffs vs. Uptime
Weapon Archetypes
| Weapon | Type | Technical Impact |
|---|---|---|
| Detonation Unit | BiS | Multiplies total INT by 16% and applies a rare Arts DMG Taken debuff. This debuff is an independent multiplier in the damage formula. |
| Freedom to Proselytize | Signature | Provides team-wide 14.4% ATK buff for 15s on heal. Since Xaihi heals on every Final Strike, she can maintain 100% uptime on this buff. |
| Dreams of the Starry Beach | F2P | Best for raw Intellect stacking; used primarily to hit higher Ultimate Amp thresholds when Detonation Unit is unavailable. |
Gear Set Synergies
Eternal Xiranite Set (Standard): Because her kit applies both “Amp” and “Heal” status effects, she maintains permanent uptime on the set’s 3-piece effect (16% Team Damage Dealt bonus).
LYNX Set (Defensive Pivot): Utilizes her overhealing mechanic. If her restoration exceeds full HP, the target gains a 30% Damage Reduction for 10 seconds, making Xaihi a viable defensive pivot in “Agony Mode” content where environmental damage is constant.
Essence Priority
- Intellect Boost – Primary amp scaling (highest priority)
- Will Boost – Overheal consistency and survivability
- Cryo/Nature DMG – Situational, secondary to base stats
Team Compositions and Rotations
Yvonne Hypercarry: The “3-Second Wait” Rule
In the Yvonne-Xaihi-Gilberta-Alesh composition, timing is critical to account for Yvonne’s backloaded damage.
Rotation Sequence:
- Xaihi Battle Skill (Pre-combat) → SP Regen
- Gilberta Battle Skill → Yvonne Basic Attacks to 2× Final Strike → Yvonne Battle Skill (Solidification)
- Xaihi Ultimate → Yvonne Ultimate
Critical Delay: Wait 3 seconds after starting Yvonne’s Ultimate before activating Gilberta’s Ultimate. This ensures that Yvonne’s strongest hits (which have delayed landing animations) all fall within Gilberta’s short-duration buff window.
The Last Rite Shatter Core
Xaihi is the non-negotiable partner for Last Rite (LR). LR requires 3 stacks of Cryo Infliction to trigger her “Shatter” combo. Xaihi provides these stacks via her “Stress Testing” combo while simultaneously amping LR’s Cryo damage.
Gear Note: In this composition, Xaihi should carry the Eternal Xiranite set to provide continuous team damage buffs, as LR is a “selfish” carry who does not provide team utility.
Cryo-Nature Hybrid Team
| Role | Operator | Function |
|---|---|---|
| Main DPS | Yvonne | Solidification trigger and burst |
| Support | Xaihi | Cryo Amp, healing, Infliction source |
| Utility | Gilberta | Enemy grouping, Nature Infliction |
| Sub-DPS | Alesh | Additional elemental coverage |
Potential Progression Path
For complete skill leveling and promotion material requirements, see the Xaihi Progression Guide.
P0 → P1: Basic uptime improvement
P2: Enhanced SP generation
P4: Extended buff duration
P5: 1.1× Ultimate multiplier (60% → 66% amp at 1200 INT)
Investment Priority: Signature weapon Freedom to Proselytize > P0 Xaihi > P5 Xaihi for max amp ceiling.
Build Recommendation
SS-Tier Cryo-Nature Enabler Setup
| Slot | Item |
|---|---|
| Weapon | Detonation Unit (BiS) or Freedom to Proselytize |
| Suit | Eternal Xiranite Disruptor |
| Gloves | Eternal Xiranite Calibrator |
| Calibrator | Eternal Xiranite Calibrator |
| Essence | Intellect Boost (3-slot), Will Boost (3-slot) |
F2P Alternative
| Slot | Item |
|---|---|
| Weapon | Dreams of the Starry Beach |
| Suit | Eternal Xiranite Set |
| Gloves | Eternal Xiranite Hands PPE |
| Calibrator | Standard Intellect |
| Essence | Intellect Boost, Will Boost |
Automated Industrial Center (AIC) Mastery
Xaihi serves as a high-efficiency specialist within the base:
Manufacturing Cabin: At Promotion III, she provides a +20% bonus to operator EXP material production.
Reception Room: She offers a unique Clue 5 Rate-UP for the “Cabal of Tranquility.” This is essential for faction diplomacy and unlocking high-tier rewards.
Standardized Scripting: Her skills prioritize manufacturing “logic,” which synergizes with the belt-throughput caps (0.5 units/s) to ensure JIT (Just-In-Time) production flows are never underfed.
Advanced Team Architectures
Quick-Swap vs. Long-Window Teams
Quick-Swap Limitation: Xaihi’s delayed Cryo Infliction (requires 2 Final Strikes first) makes her less effective in teams that require immediate elemental reactions.
Long-Window Optimization: She excels in extended engagements where:
- Her overhealing trigger can maintain 100% uptime
- Her 2.4s Final Strike frequency drives SP regeneration
- Her 25-second Battle Skill duration covers the entire fight
The Pre-Aggro Deployment Technique
Step-by-Step:
- Position team 8 seconds before enemy engagement range
- Cast Xaihi Battle Skill “Distributed DoS”
- Wait for crystal activation (visual indicator)
- Engage enemy—Xaihi enters with active crystal and immediate SP regen
This technique is essential for Agony Mode content where every second of buff uptime matters.
FAQ
What is the best weapon for Xaihi? Detonation Unit is BiS for the Arts DMG Taken debuff. Freedom to Proselytize provides 100% uptime on team ATK buff. Dreams of the Starry Beach is the top F2P option for raw Intellect stacking.
What is Xaihi’s Intellect cap? The hard cap is 1200 INT, providing 60% Cryo/Nature damage amp. At P5, this increases to 66%. Practical builds with Level 90 gear achieve ~705 INT (~45% amp).
Does Xaihi need to be on-field? Yes—her 2.4-second Final Strike is one of the fastest in the game, making her an efficient SP driver. On-field piloting maximizes her Cryo Infliction application and overhealing uptime.
Can Xaihi work with Last Rite? Yes—Xaihi is the non-negotiable partner for Last Rite. She provides the 3 Cryo stacks required for LR’s Shatter combo while amping Cryo damage. Use Eternal Xiranite set for team-wide buffs.
What gear set should I use on Xaihi? Eternal Xiranite (3-piece) is standard for 16% team damage dealt. LYNX set is viable for Agony Mode, providing 30% Damage Reduction via overhealing.
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