A recent Reddit post asked one of the oldest questions in Slay the Spire history: "Would you guys be mad if I smithed at 50/103 HP?" The community response was immediate, passionate, and — as usual — deeply split. Some said rest. Some said smith. Some demanded more context before answering. And at least one person joked about upgrading a Strike, which tells you everything you need to know about the Spire community's priorities.
But underneath the memes and the one-liners, there is an actual strategic question worth unpacking. The campfire decision — rest or smith — is one of the most important recurring choices in Slay the Spire 2. It looks binary, but it is anything but.
Why This Decision Matters More Than You Think
Every campfire in Slay the Spire 2 presents a fork that scales in complexity with the rest of your run. On the surface, it is heal or upgrade. Regain a chunk of HP, or permanently strengthen one card in your deck. Both are obviously good. The difficulty is that you can only pick one, and the correct choice depends on information that is easy to overlook.
New players tend to default to resting. That instinct is not wrong — surviving the next fight is always more important than having a slightly better deck for a fight you might not reach. But intermediate and advanced players learn something that changes the calculus entirely: a well-timed upgrade can be worth more than any amount of healing, because it changes the shape of every future combat, not just the next one.
The catch is that a poorly timed upgrade can also waste the campfire entirely. If you upgrade a card that does not meaningfully improve your combat output or survivability, you have spent your rest site on nothing. The Reddit joke about upgrading Strike into Strike+ is funny precisely because it captures a real mistake players make: smithing for the sake of smithing, without evaluating whether the upgrade actually matters.
The Case for Resting
Resting is defensive. It keeps you alive. In a game where death is permanent and progress is not, that has intrinsic value. Here is when resting is almost certainly correct:
You are about to fight a boss. If the next node on your path is a boss encounter, your HP total is not a resource to invest — it is a survival threshold. Bosses in Slay the Spire 2 can swing hard and fast. Going into a boss fight at 50 HP when you could have entered at 80 is the kind of decision that looks fine until it is not.
Your deck has no high-impact upgrade targets. Not every card benefits equally from an upgrade. If your deck is full of cards where the upgrade is marginal — a small number bump, a minor cost reduction that does not change your energy math — then resting is usually better. Upgrading for the sake of it is a trap.
You have no remaining rest sites on your path. If this is your last campfire before a critical encounter, the decision simplifies dramatically. Healing now is the only chance to recover HP before the next major test. That alone can make rest the clear pick.
Your HP is critically low. There is a threshold below which no upgrade matters because you simply cannot survive the next hallway fight. That threshold varies by character, deck composition, and enemy pool, but if you are genuinely at risk of dying to a basic encounter, heal first. A dead run cannot use upgraded cards.
The Case for Smithing
Smithing is offensive. It makes your deck permanently better. And in a game where exponential scaling often determines whether you can survive the late acts, permanent improvements compound in ways that healing never can. Here is when smithing is likely correct:
You have a key card that transforms with an upgrade. Some cards in Slay the Spire 2 change dramatically when upgraded. A card that gains an extra hit, shifts from an awkward energy cost to an efficient one, or gains a new keyword can alter your entire combat plan. These upgrades are worth more than almost any heal.
Your HP total is actually fine. This is the crucial insight that the Reddit thread demonstrated. 50 out of 103 HP sounds low because the max is high. But 50 HP is often more than enough to survive the next several floors, especially if your deck has solid block generation. HP is a resource, not a score. You do not need to keep it full — you need to keep it sufficient.
You have more rest sites ahead. If your pathing includes another campfire before the next boss, you can often afford to smith now and heal later. This is one of the most common reasons experienced players choose upgrades over rest: they have already scouted the map and know recovery is available downstream.
You are playing a character with strong block tools. The Silent, for example, has access to some of the best defensive cards in the game. If your deck can reliably prevent incoming damage, your effective HP is much higher than your displayed total. Smith the card, trust your block, and move forward.
Context Is Everything
The Reddit thread's most upvoted response was not "rest" or "smith." It was "we need more context." That answer is correct, and it highlights the deeper lesson: campfire decisions cannot be evaluated in isolation.
Here is what you actually need to know before choosing:
What floor are you on? Early in an act, there is more room to recover. Late in an act, every HP point matters more. The closer you are to a boss, the more rest gains priority.
What is the boss? Some bosses punish low HP more than others. If the upcoming boss has a burst damage pattern, your HP threshold for safety is higher. If the boss is a slow grind, you may need deck quality more than raw health.
What does your deck actually need? This is the question most players skip. Look at your deck. Is there a single card that, if upgraded, would meaningfully change your combat output? Not slightly improve — meaningfully change. If yes, that is probably worth more than healing. If no, rest.
What relics are in play? Several relics in Slay the Spire 2 interact with rest sites. Some grant bonus effects when you rest. Some grant bonus effects when you smith. Some add max HP on rest. If you have a relic that provides +5 max HP every time you rest, the value of resting goes up substantially — not just for the immediate heal, but for the permanent stat gain. The Reddit poster had three separate rest-site relics, which makes the decision even more layered.
What potions do you have? A well-timed potion can substitute for the HP you would have gained by resting. If you are carrying a healing potion or a strong defensive potion, you might be able to smith safely and use the potion to cover the gap.
How Experienced Players Think About It
One of the more pointed comments in the Reddit thread said: "You can tell who did and did not play STS1 extensively." That is not gatekeeping — it is an observation about how experience changes the default setting.
Newer players default to rest because the fear of dying is immediate and visceral. Experienced players default to smith because they have internalized a harder truth: most runs do not die from low HP alone. They die from decks that cannot keep up with escalating enemy difficulty. A deck that blocks well and deals damage efficiently will take less damage in the first place, making future healing less necessary.
This is the compounding logic of upgrades. A strong upgrade does not just help in one fight. It helps in every fight for the rest of the run. Healing helps exactly once — right now. Over the course of a full run, the cumulative value of a well-chosen upgrade almost always exceeds the value of a single rest, unless you are in immediate danger.
The caveat is that this logic only works when the upgrade is genuinely impactful. Experienced players are not blindly choosing smith every time. They are evaluating their deck, identifying the highest-value upgrade target, and comparing that value against their current HP situation. When the upgrade is mediocre, they rest. When the upgrade is transformative, they smith even at low HP. The key is the evaluation, not the default.
The Rule of Thumb
If you want a simple heuristic to start with, here is one that will serve most players well:
Smith if you have a card that genuinely changes your deck's performance. Rest if you do not, or if you are about to face a boss with no remaining campfires.
That is not a perfect rule. No heuristic in Slay the Spire 2 is perfect, because the game is designed to punish autopilot. But it captures the essential trade-off: upgrades are investments, rest is insurance. The best players know when to invest and when to insure. Everyone else is guessing — and that is okay, because learning to guess better is half the fun.
Final Verdict
So, would we be mad if you smithed at 50/103 HP? No. But we would ask what you are upgrading, what floor you are on, what boss is next, and whether you have block in your deck. Because the answer to "rest or smith" is never just about the number on your health bar. It is about everything else happening in your run.
The bottom line: Rest vs. smith is not a binary choice with a universal answer. It is a context-dependent evaluation that tests your understanding of your own deck, your pathing, and your risk tolerance. Default to smithing when you have a high-impact upgrade and your HP is sufficient. Default to resting when your HP is critical or no upgrade will meaningfully change your trajectory. And when in doubt, remember: HP is a resource, not a high score. Spend it wisely.