Healing items become substantially more important once Phantom Blade Zero opens its medicine-upgrade system, but that system is not available from the outset. It arrives around the middle of the game during exploration of Pangzhen, and its first point of contact is the Green Serpent House in the town’s Backstreets area.
The essential route is straightforward: progress through Pangzhen’s main quests until the Green Serpent House becomes reachable, enter it, and speak with Xie Xiaorong behind the counter. That conversation unlocks medicine upgrades. There is no indicated shortcut around the story progression, so players already wandering Pangzhen but unable to reach the house should keep following the primary path through the town.
That first visit matters because it turns healing from a fixed safety net into a buildable part of a player’s setup. Medicine upgrades can improve healing effectiveness and increase the number of uses available for healing items. In a game where recovery resources can decide whether an extended encounter remains manageable, that is a meaningful change rather than a minor menu option.
Where to unlock medicine upgrades
Head to the Green Serpent House in Pangzhen Backstreets and talk to Xie Xiaorong at the counter. Pangzhen can take time to navigate even after it is reached, but the main quest path through the desolate settlement eventually leads to the house.
For more context, explore Switch 2 Reaches 26.35 Million Consoles as Hardware Sales Cool and Game Sales Rise.
Players do not need to make a return trip to the Green Serpent House every time they want to improve a medicine item. Once the feature is unlocked, medicine is incorporated into the broader Upgrade Equipment menu available at any Bell. In practical terms, the Green Serpent House is the gate that enables the system, while Bells become the convenient places to use it afterward.
A Bell is therefore more than a recurring interaction point for equipment administration: after the Pangzhen unlock, it is also where a player can assess their current medicine choices and commit materials to them. This makes it easier to react to a new medicine item without retracing the route through the Backstreets.
What medicine upgrades cost
Every medicine level requires two categories of resource:
- Remnant Dust, the quantity of which increases at higher levels.
- One Healer’s Memory appropriate to that upgrade tier.
The cost structure is tiered. Early upgrades are comparatively accessible, but the system asks for progressively rarer versions of Healer’s Memories later on. Levels 1 and 2, for example, each use a single Apprentice Healer’s Memory. Levels 3 and 4 move up to a Skilled Healer’s Memory.
That distinction is worth understanding before spending. Remnant Dust is a numerical cost paid in amounts described as a few thousand per level, whereas Healer’s Memories are quality-gated upgrade materials. The latter are not merely another currency total: their rarity rises with the level requirement. A player with plenty of Remnant Dust can still be held back if they do not have the matching type of Memory.
Healer’s Memories of different qualities can be found throughout the game. They can also be purchased from the Bell shop, although the shop’s supply is limited. Limited stock changes the decision from “upgrade everything eventually” to “preserve flexibility for the medicine that is actually in use.” Buying a Memory may solve an immediate problem, but it does not mean an endless supply is available on demand.
The key warning: medicine investments are permanent
The most important property of medicine upgrades is that they cannot be reversed. Weapon upgrades can be reverted, but medicine upgrades do not offer that same recovery option. Once Remnant Dust and a Healer’s Memory are committed, they stay committed to that particular medicine investment.
This does not mean medicine upgrades should be avoided. Their benefit is explicitly tied to stronger healing and more healing-item uses, both of which are valuable. It does mean that upgrading every item as soon as it appears is a poor default approach, especially once rarer Memories enter the equation.
A sensible spending order
- Identify the medicine currently equipped and relied upon. Invest in the items doing real work in the current setup.
- Prioritize early levels on that active selection. Apprentice Healer’s Memories serve levels 1 and 2, letting players improve their established tools before consuming higher-tier materials.
- Hold onto spare Memories where possible. This reserves the ability to strengthen a better medicine quickly if it replaces the current favorite.
- Check Bell shop stock with restraint. Purchasable Memories are useful, but limited availability makes them resources to consider carefully rather than automatic buys.
The reasoning is simple: permanent upgrades have an opportunity cost. Putting a Memory into a medicine that is soon abandoned can leave the preferred replacement at base strength until another suitable Memory is found or purchased. Conserving some materials makes a later switch far less disruptive.
This is especially relevant when higher levels request rarer Memory grades. Players who reach the point where Skilled Healer’s Memories are needed should treat them as a narrower pool of advancement material. There is no supplied indication that the game lets players downgrade, refund, or transfer those investments, so a deliberate choice is safer than broad experimentation.
Why the unlock changes Pangzhen planning
Pangzhen is not only the setting for the medicine upgrade unlock. Continued progression there eventually provides the Flaming Mane weapon. Flaming Mane is significant because it enables entry into other Serpent Houses found around the world, locations that are important to the main quest.
That gives the Pangzhen stretch a useful sequence of priorities. First, follow the main route until the Green Serpent House and its medicine system become available. Then use a Bell to review the active medicine setup and decide whether the available Remnant Dust and Memories justify immediate improvement. Keep moving through the area’s story progression, which eventually yields Flaming Mane and expands access to the wider network of Serpent Houses.
It is a progression chain with both immediate and longer-term value. Medicine upgrades improve the resources a player brings into difficult situations now. Flaming Mane, by contrast, expands where the main quest can go next. Neither benefit requires treating every medicine item as an upgrade target.
Helpful quest timing before the Backstreets
For players deciding what to finish before focusing on Pangzhen Backstreets, the Four Fierce Axes quest is a useful task to wrap up first. After heading into the Backstreets, the next objectives include finding the Mandate Encampment Key and completing the Flesh Lily quest.
That order is not a substitute for main-story progress—the Green Serpent House itself is reached through that progression—but it helps frame the nearby work. Finish Four Fierce Axes if it is still pending, advance toward the Backstreets and the Green Serpent House, then keep an eye out for the Mandate Encampment Key while moving on to Flesh Lily.
For another concise look at the same upgrade path, see this medicine unlock and upgrade overview.
Quick checklist
- Reach Pangzhen and follow the main quest into the Backstreets.
- Enter the Green Serpent House.
- Speak to Xie Xiaorong to unlock medicine upgrading.
- Use the Upgrade Equipment menu at any Bell for later medicine upgrades.
- Budget a few thousand Remnant Dust and one matching Healer’s Memory per level.
- Remember that levels 1–2 use Apprentice Healer’s Memories, while levels 3–4 use Skilled Healer’s Memories.
- Spend primarily on medicine items currently in use, because upgrades cannot be refunded.
- Save some Memories for an immediate upgrade if a better medicine item replaces the current choice.
The takeaway is less about racing to spend every material and more about unlocking the option early, then using it with intent. Reaching Xie Xiaorong at the Green Serpent House opens a permanent progression system with tangible healing benefits. Since its investments cannot be undone, the best value comes from strengthening the medicine items that have already earned a place in the current loadout.
