Booster Pack Heroes Rarest Heroes: Odds & Evidence

Real gameplay reference by FungalBrainRot, observed build v1.0.27D; not official footage or proof of later patch behavior.

Which are the Booster Pack Heroes rarest heroes?

Portal has a confirmed Legendary Hero label and a verified 1% Magic Pack outcome, but identifying the single rarest hero across the game requires more evidence. If you are searching for Booster Pack Heroes rarest heroes, that distinction matters because rarity labels and acquisition odds answer different questions. This Booster Pack Heroes rarest heroes guide explains the verified pack percentages, Portal’s classification, and the gaps that prevent a reliable global ranking.

The clearest answer is that Portal is the rarest verified Magic Pack hero at 1%. That supports a comparison within Magic’s documented pool; it does not establish Portal as the globally rarest hero.

This guide covers zup games’ Booster Pack Heroes on the official Steam store. The observations come from player experience footage uploaded November 11, 2026. Its menu displays version v1.0.27D; these observations do not establish behavior in v1.0.30D.

There is enough evidence to explain several useful rarity distinctions. There is not enough to publish a complete rarest-to-most-common hero list. If you are still learning the game’s terminology, keep the Booster Pack Heroes beginner guide alongside this reference.

What the four verified pack pools show

The documented Basic, Advanced, Magic, and Royal pools use the same displayed percentage pattern: 60%, 30%, 9%, and 1%. Their named outcomes differ, so the pack matters when you are pursuing a particular card.

The 30% hero outcomes are Rare, while the 9% hero outcomes are Epic. Basic, Advanced, and Royal identify Legendary Tomes at 1%. Magic’s 1% outcome is Portal, a Legendary Hero.

Pack pool and footage	60% outcome	30% Rare Hero	9% Epic Hero	1% outcome
Basic Pack pool	Squire	Barbarian	Ranger	Thunderstorm — Legendary Tome
Advanced Pack pool	Monk	Knight	Pyromancer	Raise Dead — Legendary Tome
Magic Pack pool	Witch Doctor	Demon Slayer	Illusionist	Portal — Legendary Hero, resolved by the later tooltip
Royal Pack pool	Bannerman	Duelist	Stormcaller	Dragon’s Call — Legendary Tome

For a Booster Pack Heroes rarest heroes comparison, the distinction between heroes and Tomes is essential. Thunderstorm’s 1% listing does not make it a 1% hero. Portal demonstrates that a Legendary outcome can also be a Hero.

Among the named heroes in these four pools, Portal’s 1% Magic listing is lower than the displayed 9%, 30%, and 60% hero outcomes. Ranger, Pyromancer, Illusionist, and Stormcaller each appear at 9% in their respective pools. These comparisons do not establish a complete game-wide rarity ranking.

These four pools are a partial reference. Nature Pack has five outcomes. Tome Pack displays 11 rows with rounded 9% values, including three unknown entries. Those rounded rows do not establish exact probabilities or reveal the unknown entries’ identities.

The Advanced and Royal box descriptions each show three packs of the corresponding type. That establishes the box contents. It does not supply a separate Foil probability or demonstrate a special rarity bonus for buying a box.

When checking your own screen, compare the entire row: pack name, card name, percentage, and card category. A percentage separated from its outcome can easily produce the wrong conclusion.

Portal’s Legendary Hero label and verified 1% Magic Pack chance

Portal is the strongest reason to avoid treating “Legendary” and “Tome” as interchangeable. Its card and upgrade screen identifies Portal as a Legendary Hero.

That makes Portal relevant to any Booster Pack Heroes rarest heroes discussion. Its classification alone does not establish acquisition odds, but the later pack tooltip provides the necessary evidence for Magic.

Portal detail	What the documented evidence supports
Card category	Hero
Rarity label	Legendary
Function	Spawns allies from the Collection
Portal Calibration	Shows +25% activation rate
Magic Pack probability	1%, established by the later pack tooltip

Portal Calibration’s bonus concerns activation. It is not evidence of a 25% chance to acquire Portal from a pack. The card and upgrade screen itself does not establish Portal’s precise pack probability.

The earlier Magic pool shows an undiscovered 1% entry. The later Box of Magic Pack tooltip resolves that entry and displays the complete pool: 60% Witch Doctor, 30% Demon Slayer, 9% Illusionist, and 1% Portal.

The defensible conclusion is that Portal is a Legendary Hero with a verified 1% ordinary Magic Pack card outcome. That percentage is not a Foil chance. It makes Portal the rarest verified hero in this Magic pool, while a global rarity ranking remains unverified.

Rarity, drop chance, Foil, and Interloper need separate evidence

A useful Booster Pack Heroes rarest heroes answer keeps four questions separate: what rarity a card carries, how often a displayed outcome appears, what Foil means mechanically, and what Interloper means mechanically.

The supplied evidence answers the first two questions for several cards. It does not establish Foil or Interloper rules, rates, or their relationship to the documented pools.

Term or measurement	Question it answers	Evidence boundary
Card rarity	What rarity label does this card carry?	Portal is Legendary; Duelist is Rare
Displayed outcome chance	What percentage does this pool assign to this entry?	Basic, Advanced, Magic, and Royal show 60%, 30%, 9%, and 1%
Foil	What verified rules apply to Foil?	No Foil mechanics or acquisition rate supplied
Interloper	What verified rules apply to Interloper?	No Interloper mechanics or acquisition rate supplied

Do not read the Advanced Pack’s 1% outcome as a Foil chance. That percentage belongs to Raise Dead in the displayed Advanced pool. Likewise, the supplied observations do not establish an Interloper percentage.

Duelist provides another example of why percentages need context. Its hero screen shows a Rare Outcast Hero, while Royal supplies its pack association. “Outcast” and “Royal” describe different information; the class family does not replace the pack pool.

The same Duelist screen shows Lucky Duel giving a 10% chance to earn one Coin when Duelist defeats an enemy. That is a conditional combat reward, separate from Duelist’s 30% Royal Pack listing.

The screen also displays 15,000 Mastery for that upgrade. Treat this as the amount visible in that player’s footage, rather than a universal starting cost. For related progression reading, see the Booster Pack Heroes Mastery guide.

How to use the evidence when choosing packs

The practical goal of a Booster Pack Heroes rarest heroes search is to make a better collection decision. The following recommendations follow from the documented screens; they are recommendations, not additional observed mechanics.

Your target or question	Recommended check	Supported conclusion
Ranger or Pyromancer	Inspect Basic or Advanced, respectively	Each appears at 9% in its documented pool
Illusionist or Stormcaller	Inspect Magic or Royal, respectively	Each appears at 9% in its documented pool
Duelist	Check Royal and the card’s own details	Royal lists 30%; the card is a Rare Outcast Hero
Portal	Check Magic’s named 1% entry	Portal is a Legendary Hero listed at 1%
Foil or Interloper odds	Find evidence addressing that exact question	The supplied pack percentages do not answer it

Start with a named target. “I want Stormcaller” points you toward the documented Royal pool. “I want the rarest thing” leaves unresolved whether you mean a hero, a Tome, a rarity label, or an acquisition condition that has not been verified.

Then check the version and the current pool display. These observations provide a launch-build reference, not a guarantee that every later screen will match. If your game shows different names or percentages, record that difference before relying on this table.

Also distinguish probability arithmetic from game behavior. As a hypothetical calculation, ten independent rolls with an unchanged 9% success chance would produce about a 61.1% chance of at least one success. This assumes independence and a constant rate; the supplied observations do not verify those assumptions or any guarantee system.

That example explains why a displayed percentage should not become a promise about your next few results. A 9% listing does not mean the card must appear within a particular number of attempts.

Finally, avoid using collection-completion claims as proof of a complete rarity catalog. The source video’s “100%” title is creator wording. Its end screen and 38/38 display do not establish that every current card or acquisition condition has been documented. This catalog remains partial.

For related resource planning, consult the guide to getting Folium fast in Booster Pack Heroes. Keep those progression decisions separate from claims about drop rates until the relevant pool is visible.

Booster Pack Heroes rarest heroes FAQ

Is Portal the top answer for Booster Pack Heroes rarest heroes?

The supplied evidence does not establish a globally rarest hero. The documented Portal screen confirms its Legendary Hero classification, and the later Magic Pack tooltip lists it at 1%. Portal is the rarest verified Magic Pack hero; a global claim requires broader comparisons.

Which documented heroes have a 9% chance?

Ranger appears at 9% in Basic, Pyromancer in Advanced, Illusionist in Magic, and Stormcaller in Royal. These are Epic hero outcomes in the documented v1.0.27D pools. They have lower displayed chances than the named 30% and 60% hero entries in those same pools.

Are all 1% cards Legendary Tomes?

No. Thunderstorm, Raise Dead, and Dragon’s Call are the identified Legendary Tome outcomes listed at 1%. Magic’s 1% outcome is Portal, a Legendary Hero. The later tooltip resolves the earlier undiscovered entry, so its identity and category are established.

Do these percentages reveal Foil or Interloper odds?

No. The supplied percentages describe the listed pack outcomes, including Portal’s ordinary 1% Magic Pack outcome. They do not establish Foil rates, Interloper rates, or how either relates to card rarity. Answering those questions requires evidence that specifically documents the relevant rules or acquisition chances.

Related guides

• Best Heroes & Upgrade Priorities
• Demon Slayer Boss Build & Triggers
• Duelist Unlock: Known Information