Guide
How the kit works
You can start a fight with Summary Execution, which deals Quantum DMG equal to 80% of Xueyi’s ATK to all enemies after combat begins. On her turn, use Iniquity Obliteration against the target you want to focus. Its listed damage is 140% of ATK to that enemy and 70% to adjacent enemies. Mara-Sunder Awl hits one target for 100% of ATK.
Karmic Perpetuation tracks Karma. Xueyi gains more stacks when her attacks reduce more Toughness; a teammate’s attack that reduces Toughness gives her one stack. At eight stacks, she consumes them and immediately launches a Follow-Up ATK with three hits, each dealing 90% of her ATK as Quantum DMG to a random enemy. That attack does not generate Karma.
Perspicacious Mainframe keeps up to six Karma stacks that exceed the limit and grants them after the Talent triggers. Use Divine Castigation to reduce a target’s Toughness regardless of its Weakness Type. It deals 250% of ATK as Quantum DMG, triggers Quantum Weakness Break if it breaks the target, and gains up to 60% more DMG based on the Toughness it reduces. Intrepid Rollerbearings gives the Ultimate 10% more DMG if the target has at least 50% of its maximum Toughness.
Build and why
For relics, start with four pieces of Genius of Brilliant Stars. It gives 10% Quantum DMG and ignores 10% of the target’s DEF when Xueyi deals damage, plus another 10% if the target has Quantum Weakness. Pair it with Talia: Kingdom of Banditry for 16% Break Effect; at 145 SPD, the planar set gives another 20%.
Thief of Shooting Meteor is an alternative four-piece set: its two-piece and four-piece bonuses each give 16% Break Effect, and it restores 3 Energy after Xueyi inflicts Weakness Break. Iron Cavalry Against the Scourge is another option for Break DMG: at 150% Break Effect, that damage ignores 10% DEF. Its extra Super Break DMG effect requires 250% Break Effect. Inert Salsotto is a planar alternative if you reach 50% CRIT Rate, raising Ultimate and Follow-Up ATK DMG by 15%.
For main stats, choose CRIT Rate or CRIT DMG on the body, SPD or ATK Percentage on the feet, Quantum DMG Boost or ATK Percentage on the sphere, and Break Effect or ATK Percentage on the rope. For substats, the game recommends Break Effect first, followed by CRIT Rate, CRIT DMG, ATK Percentage and SPD.
Whereabouts Should Dreams Rest is a strong Break-focused Light Cone: it gives 60% Break Effect and makes targets hit by the wearer’s Break DMG take 24% more Break DMG from the wearer for two turns. Indelible Promise gives 28% Break Effect and 15% CRIT Rate for two turns after an Ultimate. On the Fall of an Aeon builds ATK when Xueyi attacks and increases DMG for two turns after she breaks an enemy.
Leveling priority
Follow the game’s order: level Divine Castigation first, then Iniquity Obliteration, Karmic Perpetuation and Mara-Sunder Awl. The Ultimate is first because it can reduce Toughness against any Weakness Type. The Skill attacks adjacent enemies as well as the main target, while the Talent supplies the Follow-Up ATK as Karma fills.
For maximum ascension, you need Credit, Nail of the Ape, Extinguished Core, Glimmering Core and Squirming Core. Leveling all skills also uses Credit and the three Core materials, along with Tracks of Destiny, Shattered Blade, Lifeless Blade, Worldbreaker Blade and Past Evils of the Borehole Planet Disaster.
Eidolons worth it
For Eidolon goals, I would look at Saṃsāra, Mastered first: it lowers the Karma limit from eight to six, so the Follow-Up ATK takes fewer stacks to trigger. Klesha, Breached is another useful target. It lets that attack reduce Toughness regardless of Weakness Type and restores 5% of Xueyi’s Max HP. If it breaks an enemy, it triggers the Quantum Break Effect.
Karma, Severed is worth considering for its 40% Break Effect increase for two turns after an Ultimate. Dvesha, Inhibited raises the Talent’s Follow-Up ATK DMG by 40%. E3 and E5 add skill levels rather than new mechanics, so I would treat them as lower-priority goals, not reasons to chase progression on their own.
Common mistakes
Do not expect the Talent’s Follow-Up ATK to build its own Karma. The next activation depends on Toughness reduction from Xueyi and her teammates. Before E2, do not count on that Follow-Up ATK to reduce Toughness regardless of Weakness Type either.
Do not ignore Break Effect just because Xueyi also uses CRIT stats. Her passive turns Break Effect into a DMG increase, up to its 240% cap. At the same time, check set thresholds before committing to them: Talia: Kingdom of Banditry needs 145 SPD for its extra bonus, and Inert Salsotto needs 50% CRIT Rate for its damage bonus.
When choosing an Ultimate target, check its remaining Toughness. Reducing more Toughness raises that attack’s damage up to 60%, and a target at or above 50% of its maximum Toughness also satisfies Intrepid Rollerbearings. You can still use the Ultimate to break a target without Quantum Weakness.
