
The Odd Mushroom is a passive item in the video game The Binding of Isaac. It can be obtained from the Hypnotizing Coloured Mushrooms Event. There are two Odd Mushrooms in the game: the Odd Mushroom (Thin) and the Skinny Odd Mushroom. The Odd Mushroom (Thin) grants the player +1.7 tears, +0.3 speed, and +0.4 damage. The Skinny Odd Mushroom, on the other hand, provides a significant damage downgrade. Both mushrooms are part of the Fun Guy set, and collecting three items from this set will transform Isaac into a walking mushroom. The Odd Mushroom is considered a valuable item by some players, especially when combined with other tear modifiers that lower the tear rate, such as the Inner Eye or Mutant Spider. However, the damage downgrade of the Skinny Odd Mushroom is seen as a drawback by some players, who believe that the trade-off between increased tears and decreased damage is not worth it.
| Characteristics | Values |
|---|---|
| Type of item | Passive item |
| Damage | Damage down, damage multiplier down |
| Fire rate | Fire rate up |
| Transformation | Isaac transforms into a walking mushroom |
| Use | Better to pick it up in the first stages of the game |
| Effect | References psychedelic mushrooms, warping perception and sense |
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What You'll Learn

Odd Mushroom is a passive item
The Odd Mushroom (Thin) item increases the player's tears by +1.7, with additional copies granting +0.7 tears. It also increases the player's speed by +0.3 but decreases damage by -0.4. This item pairs well with other tear modifiers that lower the player's tear rate, such as Inner Eye, Mutant Spider, or Brimstone. It is considered a valuable item, especially if obtained early in the game, as the damage reduction is less noticeable and the player is likely to find more damage upgrades throughout the game.
The Skinny Odd Mushroom is part of the Fun Guy set, and collecting three items from this set transforms Isaac into a walking mushroom. This mushroom provides a significant tears upgrade but also comes with a notable damage downgrade. Some players opt to skip this item due to the punishing damage reduction, especially if their tear stat is already maxed out.
In addition to The Binding of Isaac, the Odd Mushroom item is also referenced in Slay the Spire, where it can be obtained from the Hypnotizing Colored Mushrooms Event. It is also a consumable item in the Calamity Mod, sold by the Truffle, which grants the player the Trippy buff, increasing damage and causing hallucinations and rainbow hues for enemies and projectiles on-screen.
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Damage down and damage multiplier down
The Odd Mushroom item in The Binding of Isaac features a damage multiplier that works differently from other items in the game. Instead of directly multiplying the damage stat, it multiplies the total added damage from other items. This results in a fractional multiplier on your damage, calculated as damage = damage * 0.65. The damage downgrade is described as “punishing” and a "damage down that stings hard".
However, the damage down effect is not as significant as it may initially seem, as it is applied before final calculations. The Odd Mushroom also provides a sizable DPS upgrade, and its impact depends on your current tears, speed, and damage stats. If you have a good amount of damage, the damage down shouldn't be too much of a problem. Additionally, if you find it early in your run and aren't close to the tear cap, it might be beneficial to take it.
The Odd Mushroom also affects the raw Damage Up total from other items, altering the "Damage Up" value before it goes through the damage formula. This interaction with other items can result in a notable decrease in damage, especially when combined with certain other items.
Overall, while the Odd Mushroom does feature a damage multiplier down, its impact depends on various factors, and it can still be a worthwhile item due to its DPS upgrade and other benefits.
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Odd Mushroom + Caffeine Pill + Mini Mush
Odd Mushroom is a passive item in the Binding of Isaac that grants +1.7 tears. Any additional copies only grant +0.7 tears. It also provides +0.3 speed and -0.4 damage, with a total damage multiplier of x0.9. It is part of the Fun Guy set, and collecting three items from this set will transform Isaac into a walking mushroom.
When combined with a Caffeine Pill and Mini Mush, the Odd Mushroom can result in a powerful combination. This item trio goes well with any other tear modifier that lowers the tear rate, such as Inner Eye, Mutant Spider, or Brimstone. While the Odd Mushroom does come with a damage downgrade, this can be mitigated by acquiring it in the early stages of the game, where the damage reduction is less noticeable.
The combination of Odd Mushroom, Caffeine Pill, and Mini Mush can lead to a significant increase in DPS (damage per second). This makes it a valuable set of items to acquire, especially if you can take advantage of the tear modifiers that complement this combination.
However, it is important to consider the trade-offs involved. The damage downgrade associated with the Odd Mushroom can be a drawback, especially if you already have other tear upgrades. Additionally, the increased rate of fire may cause knock-back, making rushing enemies more unpredictable and potentially leading to accidental damage.
Overall, the Odd Mushroom, Caffeine Pill, and Mini Mush combination can be a powerful asset in the Binding of Isaac. While there are certain considerations to keep in mind, the DPS upgrade and synergy with tear modifiers make it a worthwhile option to pursue.
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Odd Mushroom's reference to psychedelic mushrooms
The Odd Mushroom is a Hardmode consumable item in the video game The Binding of Isaac. Upon consumption, it grants the player the "Trippy" buff for one hour, increasing all damage by 50% and causing enemies and projectiles on-screen to have a hallucination effect. The Odd Mushroom has three tiers of visual effects, with each tier increasing the intensity of the effects. The effects of the Odd Mushroom are a reference to psychedelic mushrooms, which are known to warp the perception and senses of users.
Psychedelic mushrooms, also known as psilocybin mushrooms, magic mushrooms, or shrooms, are a type of hallucinogenic mushroom. They are a polyphyletic informal group of fungi that contain the prodrug psilocybin, which turns into the psychedelic psilocin upon ingestion. Psilocybin mushrooms have a long history of use in Mexican and Central American cultures for religious, divinatory, or spiritual purposes. Rock art dating back to around 9000-7000 BCE from Tassili, Algeria, is believed to depict psychedelic mushrooms and the transformation of the user under their influence.
The effects of psilocybin mushrooms can include hilarity, lack of concentration, muscular relaxation, dilated pupils, hallucinations, and an inability to discern fantasy from reality. The experience, often referred to as a "trip," is strongly dependent on the user's state of mind and the environment in which the mushrooms are consumed. A comfortable and familiar environment can contribute to a pleasant experience, while a negative environment can lead to a "bad trip." Many users find it preferable to ingest psychedelic mushrooms with friends or people familiar with "tripping."
The dosage of psilocybin mushrooms depends on the psilocybin and psilocin content, which can vary significantly between and within the same species. Psilocybin content is typically around 0.5% to 1% of the dried weight of the mushroom, while psilocin content can range from 0% to 0.59%. It is important to note that the use of psychedelic mushrooms carries risks, including potential negative psychological consequences such as panic reactions and psychosis, particularly if a large dose is ingested.
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Odd Mushroom as a consumable item
The Odd Mushroom is a consumable item in the video game The Binding of Isaac. It is a passive item that grants the player a tears up and a damage down. The Odd Mushroom has a damage multiplier that works differently from other items in the game. The Odd Mushroom's damage down may be too punishing, but it is worth it for the sizable DPS upgrade. It is especially useful when combined with other tear modifiers that lower your tear rate, such as Inner Eye, Mutant Spider, or Brimstone. It is also beneficial to pick up the Odd Mushroom early in the game, as the damage reduction will be less noticeable.
In addition to the standard Odd Mushroom, there is also a Skinny Odd Mushroom and an Odd Mushroom (Thin). The Skinny Odd Mushroom is part of the Fun Guy set, and collecting three items from this set will transform Isaac into a walking mushroom. The Odd Mushroom (Thin) has similar effects to the original Odd Mushroom but with slightly different numbers. It grants +1.7 tears, with additional copies only granting +0.7 tears, +0.3 speed, -0.4 damage, and a x0.9 total damage-up multiplier.
The Odd Mushroom is also a consumable item in the game Slay the Spire, where it can be obtained from the Hypnotizing Colored Mushrooms Event. It is likely that this Odd Mushroom is a reference to the one in The Binding of Isaac.
In the Calamity Mod for The Binding of Isaac, the Odd Mushroom is a Hardmode consumable item sold by the Truffle. Upon consumption, it grants the player the Trippy buff for one hour, increasing all damage by 50% and causing enemies and projectiles on-screen to appear as hallucinations with a rainbow hue. There are three tiers of visual effects that can be obtained by consuming additional Odd Mushrooms while the buff is active, with each tier increasing the intensity of the effects.
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Frequently asked questions
The Odd Mushroom is a passive item that increases your tears and speed but decreases your damage. It is worth it if you don't have other tear upgrades and if you have good damage to compensate for the damage downgrade.
It is better to pick up the Odd Mushroom in the first stages of the game, where your damage reduction goes almost unnoticed.
The Odd Mushroom provides a tears-up and a damage multiplier down. It is especially useful if you have a high damage/low tears item.
The main downside of the Odd Mushroom is the damage downgrade, which can be quite substantial. It also doesn't break the tear-delay limit of 5.
The Odd Mushroom goes well with other tear modifiers that lower your tear rate, such as Inner Eye, Mutant Spider, or Brimstone. It can also be useful with slow tear items, where you need multiple tear-ups to achieve a good fire rate.

























