In 'Seven Knights Re:BIRTH' (hereinafter SKRB), the 'Immunity to OO' effect is mostly a perk of rare-grade heroes. While a handful of legendary units have it, they are few and far between, making those with such utility absolute staples for PvE content like Siege Defense and Advent Expeditions. Enter 'Xiao'. By bringing 'Instant Death Immunity' to the table, she has effectively shoved 'Leo' aside and cemented her place in the meta. The noticeable spike in Sunday Siege scores among players using Xiao is proof enough. KookminTree has broken down why this new powerhouse is the missing piece of your high-score puzzle.

Q. What kind of hero is Xiao?
A. She is a hero who provides Instant Death Immunity and boosts the single-target damage of all allies.

Xiao attacks a single enemy while juggling various buffs and debuffs. The buffs come from her passive, 'Jiangshi's Talisman,' while the debuffs are triggered by 'Soul Siphon.' Her passive grants all allies two turns of Instant Death Immunity and allows her to heal 40% of her physical attack once per battle if her health drops below 50%. The real kicker comes at 6-transcendence, where she gains a powerful unique buff: 'Single-Target Damage Increase by 23%' for all allies, herself included.

Soul Siphon deals damage to one enemy and shields all allies for two turns. If the target is suffering from 'Bleed,' it deals an additional 180% damage. Leveling up this skill pumps that coefficient up to 270%. At 2-transcendence, it also adds a 5-turn, 39% defense reduction debuff.

Her 'Summon Blood Jiangshi' skill deals damage and inflicts 3 turns of Bleed on a single target. The base proc rate is 100%, though you should keep in mind that the enemy's effect resistance might get in the way. Skill upgrades are well worth it here, bumping the damage coefficient from 170% to 205%. For maximum efficiency, I recommend using 'Summon Blood Jiangshi' before 'Soul Siphon' to capitalize on that extra bleed damage.

Q. What are Xiao's key buffs and debuffs?
A. Single-target damage increase, Instant Death Immunity, and defense reduction.

Xiao gains her defense reduction at 2-transcendence and her single-target damage boost at 6-transcendence. The latter is a unique team-wide buff, and it is the primary reason why Sunday Siege high scores have skyrocketed. It doesn't discriminate between magic and physical types, and it boosts her own damage output to boot. That 39% defense reduction is nothing to sneeze at, either, making it vital for pushing those top-tier scores.

Thanks to this utility, the Sunday Siege meta has shifted from a Leo-led physical team to a Xiao-led magic composition. The top-ranked player from last week ran 'Xiao - Pascal - Miho - Xiaoqiao - Biscuit'. Why no healer? Because Miho's lifesteal and Xiao's shields are enough to keep the team standing. However, you absolutely must reach at least 6-transcendence for Xiao to be viable. While rare heroes are easier to transcend than legendary ones, the sheer volume of materials required can slow things down. Set Xiao as your wishlist target in standard summons and start farming those rare hero shards.

Q. How should I set up Xiao's equipment?
A. Depending on whether you're using her as a main DPS or not, go for the 'Avenger' or 'Gatekeeper' sets.

Xiao’s main playground in SKRB is the Sunday Siege and the Kyle Advent Expedition. Given her high skill coefficients, the 'Avenger' set is a solid choice. Since her passive healing and shields provide decent survivability, stacking 'All Attack %' stats is a smart move for maximizing damage. According to in-game stats as of February 26, some users are even opting for 'Weak Point Attack Probability' as a primary stat. It seems they are tailoring their gear to ensure they hit Kris consistently during Sunday Siege.

For those just using Xiao as a 'totem' for her defense reduction and single-target damage buff, the 'Gatekeeper' set is a popular alternative. If you are chasing high scores, stick with Avenger; if she's just there for the utility, equip Gatekeeper and aim for 'Damage Received Reduction' stats. The 'Vanguard' set should only be a temporary stopgap if your Avenger gear isn't up to scratch yet.