The bow is the one weapon no jade touches
Nine Sols gives you a jade system with 29 jades across six colours: green for talismans, yellow for Jin and experience, red for the blade and Charged Strike, blue for the parry and Unbounded Counter, purple for high-risk effects, blue-green for survivability and HP recovery.
Not one of them mentions Azure Sand, arrows or the bow. Running a full-text check across the jade list returns zero rows for any of those three terms.
That single fact rewrites the question. There is no bow build in the jade sense — you cannot stack modifiers onto your arrows the way you can onto your talisman or your parry. The Azure Bow’s damage comes from exactly two places: Kuafu’s upgrades, and how many times you can fire before the sand runs out.
So “strongest arrow” really means two separate questions. Which arrow has the best number, and which one can you afford to upgrade. They have different answers.
The three arrows, by the numbers
The wiki gives base values and states that each upgrade adds 35% of the un-upgraded value. The S and X columns below are that arithmetic.
| Arrow | Base damage | At S (+35%) | At X (+70%) | How it lands |
|---|---|---|---|---|
| Cloud Piercer | 136 | 183.6 | 231.2 | One instant beam, pierces infinitely, extends past the screen edge |
| Thunder Buster | 18 x 12 = 216 | 291.6 | 367.2 | Area explosion, 12 ticks over roughly 2 seconds |
| Shadow Hunter | 30 per hit | 40.5 | 51 | Homing projectile, hit count scales with the target’s hitbox |
Rhizomatic Arrow is not in that table because you cannot choose it. It is a key item Kuafu hands over during the True Ending, and it cannot be selected or fired like the other three.
Thunder Buster wins the number and loses the fight
216 base is the highest single-shot total in the game’s bow arsenal, and 367.2 at X is the highest ceiling of anything you can put on a target. It is also twelve separate hits delivered over about two seconds inside a fixed cloud.
That is the whole catch. Against a boss that telegraphs and repositions, the ticks you actually collect might be four or five, which puts you below a single Cloud Piercer. Against a group packed into a corridor, or a staggered boss pinned in place, it is a demolition charge.
Cloud Piercer’s 136 looks unimpressive next to 216 until you notice what it does. It is an infinitely piercing horizontal beam. It stuns or staggers enemies and most bosses. It extends slightly past the edge of the screen. And the S upgrade lets it break shields and obstacles exactly the way Charged Strike does.
That last point is not a damage improvement, it is a key. No other arrow opens shields. If you have ever been stuck behind a barrier with the sword, the bow’s first upgrade is the answer, and it costs one Dark Steel.
Shadow Hunter’s 30 per hit is the most misleading number on the page. The projectile homes, and the number of hits it lands is proportional to the size of the enemy’s hitbox — which means against a wide boss it can out-damage both, and against a slim one it is the worst arrow you own. At X it is 51 per hit. Whether that beats 231.2 depends entirely on what you are shooting.
The Dark Steel trap nobody warns you about
Here is the constraint that actually decides your bow.
Dark Steel is the hardest metal on Penglai, and the game contains exactly six pieces. Every arrow upgrade costs one Dark Steel, plus Jin: 1000 for the S step and 2500 for the X step.
| Step | Dark Steel | Jin | Per arrow |
|---|---|---|---|
| To S | 1 | 1000 | 1 Dark Steel, 1000 Jin |
| To X | 1 | 2500 | 2 Dark Steel, 3500 Jin total |
| All three arrows to X | 6 | 10500 | Every piece in the game |
Three arrows, two upgrades each, six Dark Steel. The budget balances to zero. Maxing everything is possible only if you find all six pieces, and it leaves nothing for anything else.
Which means every Dark Steel you spend is a permanent, irreversible decision about which arrow you own. Spend two on Shadow Hunter early because the homing felt good, and there is no path to X on Cloud Piercer unless you find the remaining pieces.
The order that survives this: Cloud Piercer to X first, because it is the default arrow and the S step gives you shield-breaking. That is two Dark Steel and 3500 Jin for a guaranteed 231.2 on every cast plus a tool nothing else provides. Then decide between Thunder Buster and Shadow Hunter with the remaining four, once you know whether your problem is crowds or bosses.
Azure Sand is the actual damage cap
Bow damage per shot is fixed by Kuafu. Shots per bar is not.
Azure Sand capacity starts at 2 and can reach 5 by buying three Azure Sand Magazines from Kuafu for increasing amounts of Jin. Each magazine adds exactly one shot.
| Capacity | Cloud Piercer bar at X | Thunder Buster bar at X (theoretical) |
|---|---|---|
| 2 shots (start) | 462.4 | 734.4 |
| 5 shots (three magazines) | 1156 | 1836 |
A five-shot bar of Cloud Piercer is 1156 damage from one resource refill. That is the number you are actually managing, not 136.
Sand comes back four ways: resting at a Root Node refills it completely, enemies drop it randomly, Azure Sand containers in the world can be broken, and a talisman detonation can generate it — but only under one specific condition.
The sand engine that makes the bow work
The Enhanced Qi Blast skill makes Qi Blasts that consume 3 Qi charges spawn 1 Azure Sand. It does not change Qi Blast’s damage at all. It exists purely to feed the bow.
For context, Qi Blast’s base formula is 32 Internal damage from the dash plus 32 multiplied by the Qi charges used plus one as Direct explosion damage. At the maximum 3 charges that is 32 Internal and 128 Direct.
Full Control uses up to 5 Qi charges with a different formula, and its Enhanced version adds 56 Direct damage plus a stagger when detonated at 5 charges. It hits harder in isolation. It also makes no sand.
So the choice is clean. If you want the bow to be a rotation rather than a novelty, Enhanced Qi Blast is the skill that pays for it. There is also a transmute that grants a small chance of Azure Sand when you kill enemies with talisman explosions, which stacks with the same game plan.
Everything else about playing the bow is the same parry-and-punish loop as the sword — the deflect guide and the combat guide cover the timing, and the bow is what you do after the punish window opens rather than instead of it.
Where each arrow comes from
The bow itself is not a pickup. Kuafu returns it to Yi the first time he enters the Four Seasons Pavilion, so it arrives on the main path whether you plan for it or not.
The other two arrows need key items handed to Kuafu.
| Arrow | Key item | Where the item comes from |
|---|---|---|
| Thunder Buster | Thunderburst Bomb | Chest in the Boundless Repository, after the Xingtian fight |
| Shadow Hunter | Homing Darts | Chest in Shengwu Hall, left of Jiequan’s cell after that fight |
Both key items sit behind major bosses, which means the second and third arrows arrive in that order regardless of preference. If you are following the boss order guide, Thunder Buster is available first.
Rhizomatic Bomb, found in Lear’s Secret Tomb behind three challenge rooms and Spirit Keeper: Cixing, is a different thread. It serves the Shooting Star Ending, not the bow’s upgrade path.
Reading the S and X suffixes
A lot of players look for a third tier above X and never find one.
The first upgrade appends an S to the arrow’s name: Cloud Piercer S. The second upgrade replaces that S with an X: Cloud Piercer X. There are only two steps, and the X version is the final form. If you see both suffixes in a video and assume three tiers, that is where the confusion comes from.
Each step is worth 35% of the original value, not 35% compounding. Cloud Piercer goes 136, then 183.6, then 231.2 — not 136, 183.6, 247.9. The second upgrade is worth the same absolute damage as the first, which is why the first one is always the better buy if you are short on Dark Steel.
The short version
Upgrade Cloud Piercer first and take it to X. It costs two of the game’s six Dark Steel and gives you the only shield-breaking ranged option plus a stagger you can rely on.
Then buy all three Azure Sand Magazine upgrades so a full bar is five shots instead of two, and pick up Enhanced Qi Blast so your talisman rotation manufactures ammunition.
Leave Thunder Buster for the fights where something is standing still. Check the best jades tier list for where your jade budget should go instead, since none of it is going to the bow — and the gear guide for the rest of Yi’s kit.