Yun Jin 
✦ Geo Support Guide ✦
Welcome to my Yun Jin Guide! We will cover basic info while also going deep into mechanics and playstyles.
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✦ Quick Infographic ✦
✦ Introduction ✦
Yun Jin is a 4 star Geo Polearm user with a very unique kit that enables her to buff Normal Attack damage for your team. She is very easy to play and to build, requiring only enough Energy Recharge and as much Defense as possible (a hardly wanted stat by most characters). She is most known for her abilities to rival or even surpass Bennett as a Yoimiya support. Let's explore her gameplay, how to build her and some of the best teams to play Yun Jin in!
✦ Talents Overview ✦
✦ Elemental Skill: Opening Flourish ✦
Press
Deals AoE Geo DMG.
Hold
Charges up, granting a shield for its duration. Dealing AoE Geo DMG when: released, when it's duration ends or if the shield breaks. A Charge Level 1 or Level 2 will be cast depending on the time spent charging it.
• Cooldown 9s
• Generates 2 Elemental Particles on press, 2.5 on Charge Level 1 and 3 on Charge Level 2
• The shield has a 150% effectiveness against all Elemental and Physical DMG. It scales off Yun Jin's HP.
• C1 will decrease this skill's cooldown by 18% (making it 7.4 sec)
✦ Elemental Burst: Cliffbreaker's Banner ✦
Deals AoE Geo DMG and grants all nearby party members a Flying Cloud Flag Formation.
Flying Cloud Flag Formation
When Normal Attack DMG is dealt to opponents, Bonus DMG will be added based on Yun Jin's current DEF.
• Cooldown 15s, Duration 12s
• The buff has a total of 30 activations (Trigger Quota) per cast
• If a Normal Attack hits multiple targets the effect will consume Trigger Quotas according to the number of enemies hit
• It does not snapshot (meaning it will use Yun Jin's DEF in real time)
• C2 will grant the party 15% Normal Attack DMG for 12s
• C6 will grant characters under the effect +12% Normal Attack Speed
How does it work?
Her buff is a flat bonus that is multiplied by the damage dealer's Crit and DMG multipliers but it will ignore Talent multipliers. That's why she works best with characters with fast normal attacks even if they have low Talent Multipliers. Like many polearms, bows and some sword users. The buff is based on Yun Jin's current DEF.
✦ Normal Attack: Cloud-Grazing Strike ✦
Yun Jin's basic attack is rarely useful unless you are waiting for the switch cooldown or need a Favonius Lance proc. It is recommended to not level up this Talent.
✦ Ascension 1: True to Oneself ✦
Using her skill at the precise moment when Yun Jin is attacked will unleash its Charged Level 2 form (handy for the extra energy provided and the damage increase).
✦ Ascension 4: Breaking Conventions ✦
The Normal Attack DMG Bonus granted by her Burst is further increased by 2.5%/5%/7.5%/11.5% of Yun Jin's DEF when the party contains characters of 1/2/3/4 Elemental Types, respectively.
• When forming a team keep in mind that this Talent is handy but not mandatory as some resonance can easily make up for it
✦ Talent Priority ✦
The priority is on the Burst to increase the Normal Attack buff Yun Jin provides. Her Elemental Skill can be left at lv6 for a good cost/value. Normal Attack talent, instead, should be left at lv1.
✦ Build and Artifacts ✦
Artifact sets
• 4 Husk
Husk is her best set, offering high DEF, that translates to a higher buff potential. It's also very easy to keep the full effect up as she will be mostly off-field. The only downside is that for some accounts the Husk domain is a very bad investment. I would not recommend farming it unless you need extra Husk pieces for Geo DEF characters or the Clam set.
• 4 Noblesse Oblige
Noblesse is a very viable set that trades DEF (compared to Husk) for a more generic ATK buff. It might even surpass it in total team damage if used properly by other characters. The set effect will only have 3 sec of downtime if you Burst at every cooldown.
• 2 piece mix
You can opt for 2 piece Defender's Will as a cheap build, it will provide a total of 60% DEF (with 2 Husk) but 4 star artifacts have lower main and sub stats than 5 stars. The Defender's pieces should be flower and feather to make it work. 2 Emblem to get +20% ER or whatever has the right main and sub stats is also totally fine on Yun Jin.
• 4 Archaic Petra
Archaic can be a very good pick (in a Yoimiya team for example) but it remains very conditional as it doesn't work on Slimes/Spectres and Yun Jin needs to be the one that picks up the Crystal to make the set work.
Main/Sub Stats
• Sands | DEF or ER%
Usually DEF for ER weapons and ER for Deathmatch (unless you can provide enough ER substats)
• Goblet | DEF
Geo DMG is not recommended as her damage output is very poor
• Circlet | DEF or C.Rate
Go Crit rate if you don't have enough Crit while using a Favonius Lance
Your substats will focus on DEF% and ER%. Crit Rate/Dmg are ok as you still dish out some damage but not of great importance. Flat Def is welcome but not mandatory.
✦ Weapons ✦
This section is going to be very short, hopefully a real DEF Polearm or something like Elegy/Freedom-Sworn will be released in the future!
• Favonius Lance is her best in slot, providing ER and Energy for the entire team but requires decent Crit Rate and Refinement
• Kitan Cross Spear is a good f2p option but you won't use the EM substat nor be able to Skill > Burst immediately
• The other weapons are basically only relevant by the amount of ER they provide
• The only polearm with a DEF boost is Deathmatch. Yun Jin's Burst does not snapshot her DEF but the DEF provided by Deathmatch will stay when going off-field. It remains conditional as it works only vs 2+ enemies, but the weapon will check for the number of opponents only when on-field. It also requires higher ER stats but works in a very refined and invested build or with low ER requirements (Geo teams). It's still generally not recommended over Favonius Lance.
✦ Teams ✦
I will show a few examples but first let's generally list who works well with Yun Jin and who doesn't:
• Yoimiya is the best duo for Yun Jin because of her fast attacks playstyle. Beware that Yoimiya's Normal Attack buff from her skill will not be multiplied with Yun Jin's buff (it works as a different multiplier not influenced by Yun Jin's buff)
• Ayato, Noelle, Razor, Fischl and Childe can make great use of Yun Jin as their playstyle revolve around Normal attacks but pairing them together is often not that recommended
• Ningguang will always fire at least 2 Normal Attacks that will AoE with C1. Together they will also activate Geo resonance (with a shield) making it a decent but not optimal duo as Ningguang's kit also focusses on Charged Attacks, Skill and Burst (and Yun Jin will not buff any of that)
• Hu Tao is not a bad pair especially in a team with Zhongli and Xingqiu. Changing the Hu Tao combo to accommodate more Normal Attacks is welcome (N2C combo)
• UNITS TO AVOID
Yun Jin's buff does NOT work with Raiden during Burst (her attacks are considered Burst damage) and remains a mediocre pair for many other Main DPS that have more sources of damage other than Normal attacks, like, for example: Itto, Diluc, Eula, Ayaka and Yanfei.
Yoimiya Vape + Double Geo
One of the best teams for Yoimiya that has no problem keeping 2 Geo with her without them disrupting any Vape combo (because of how little Geo will actually be applied).
Elemental Main DPS
As of 2.8 there are not many Catalyst users that can fully benefit from this kind of hyper carry team. But self infused characters like Yoimiya and Ayato or Melee characters with a Bennett or Chongyun infusion can be really fun to play.
Double Geo welcomes anyone
A duo that is not only good for supporting but also, adding an Electro and a Cryo unit, you can make Zhongli into a fine Superconduct Main DPS. Among the best choices for this kind of playstyle look into Rosaria and Fischl.
Noelle's dream team
Note: Gorou's DEF buff only applies to the on-field unit and Yun Jin does not snapshot her Defense.
Razor Superconduct
There are more units that can use Yun Jin in their teams but Yoimiya is absolutely her best pair.
She also allows anyone to be a somewhat decent Main DPS. You can push Bennett + Kazuha with her to make any Catalysts user (not Geo or Anemo) do high Normal Attack DMG or infuse Normal Attacks with Cryo (Chongyun) or Pyro (Bennett).
Another way is Superconduct with fast attacking characters like Zhongli or Fischl.
She is very future proof for now so hopefully in the future we will have even more characters that make her shine.
✦ Constellations ✦
Green = Very good
Yellow = Average
Red = Not important or worth
C1 • Elemental Skill CD is decreased by 18% (making it 7.4 sec), handy to generate more energy but not too important
C2 • Extra 15% Normal Attack DMG buff for 12s when using her Burst
C3 • + 3 Level to her Burst Talent; a good increase to her DEF to DMG conversion
C4 • When she triggers a Crystalize reaction, her DEF is increased by 20% for 12s
C5 • +3 Levels to her Skill Talent; not very significant as her damage output is very low
C6 • Characters affected by her Burst buff will have their Normal Attack Speed increased by 12%. Her best Constellations and one of the best ways to increase a character's dps with no draw backs
No Constellation is mandatory for Yun Jin but they are all overall pretty ok. Stopping at C0 or C2 is recommended for low spenders and f2p.
END
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