Risk of Rain 2

Risk of Rain 2

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Items stacking. Infinite or not?
So, I've seen people on Youtube stacking like 60 bustling fungus or something but in game it says the highest stack count is 5.

Can anyone pls enlighten me? Are items infinitely stackable or not?
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Items stack infinitely but I believe theres diminishing return at certain numbers of dupes. The highest stack count you are referring to is your highest stack of that item if you read that in the item menu
Originally posted by Twista:
but in game it says the highest stack count is 5.
thats not the max, thats just your highscore of how much bungus you held at once
you can stack items infinitely, though some items have diminishing returns, because it would be dumb if you could stack just ~10-15 tougher times to have a 100% chance of blocking damage
Items do stack infinitely, but there are different stacking formulas for different items. For starters, the logbook entry about an item provides some vital information, but it is not the full picture.
Let's take shaped and glass lens-maker glasses for example:

Shaped Glass
"Increase base damage by 100% (+100% per stack). Reduce maximum health by 50% (+50% per stack)."

Lens-Maker Glasses
"Your attacks have a 10% (+10% per stack) chance to 'Critically Strike', dealing double damage."

While the wording on these items is similar, they stack very differently. Glasses stack linearly, each stack adds a flat 10% critical chance, once you have 10 stacks your odds of critting reach 100%, further stacks do nothing. Glass however does not add a flat 100% to your base damage per stack, it doubles your damage with each stack. One stack will increase your damage to 200%, 2 stacks will take it to 400%, and so on. In the same vein, your health will be reduced by 50% on the first stack, and then by 50% of the remaining 50%, and so on.

Furthermore there are items with hyperbolic scaling, like tougher times for example, in which the odds of its effect triggering as you stack it approach, but can never reach, 100%. If you read the logbook description of tougher times you will see it supposedly adds a 15% chance of proccing with each stack, so if it stacked linearly you would have a 90% chance of activating it with 6 stacks. In practice, thanks to its hyperbolic scaling it has a 47% chance of activating at 6 stacks.

Lastly, there are some items that while scaling technically linearly, scale in two different stats, making them effectively multiplicative. Shurikens and gasoline are two examples, as shurikens gain both damage per projectyle and faster reloading speed with each stack, and gasoline increases in both damage and area of effect with each further stack. These items deserve mentioning because they stack extremely well despite having the more "standard" linear scaling.

So tl;dr: items stack infinitely. Some have a hard cap, some have diminishing returns, some have very bad scaling past the first stack and are better as a one-of, and some scale better the more you stack them.
Originally posted by lordclipsus:
Items do stack infinitely, but there are different stacking formulas for different items. For starters, the logbook entry about an item provides some vital information, but it is not the full picture.
Let's take shaped and glass lens-maker glasses for example:

Shaped Glass
"Increase base damage by 100% (+100% per stack). Reduce maximum health by 50% (+50% per stack)."

Lens-Maker Glasses
"Your attacks have a 10% (+10% per stack) chance to 'Critically Strike', dealing double damage."

While the wording on these items is similar, they stack very differently. Glasses stack linearly, each stack adds a flat 10% critical chance, once you have 10 stacks your odds of critting reach 100%, further stacks do nothing. Glass however does not add a flat 100% to your base damage per stack, it doubles your damage with each stack. One stack will increase your damage to 200%, 2 stacks will take it to 400%, and so on. In the same vein, your health will be reduced by 50% on the first stack, and then by 50% of the remaining 50%, and so on.

Furthermore there are items with hyperbolic scaling, like tougher times for example, in which the odds of its effect triggering as you stack it approach, but can never reach, 100%. If you read the logbook description of tougher times you will see it supposedly adds a 15% chance of proccing with each stack, so if it stacked linearly you would have a 90% chance of activating it with 6 stacks. In practice, thanks to its hyperbolic scaling it has a 47% chance of activating at 6 stacks.

Lastly, there are some items that while scaling technically linearly, scale in two different stats, making them effectively multiplicative. Shurikens and gasoline are two examples, as shurikens gain both damage per projectyle and faster reloading speed with each stack, and gasoline increases in both damage and area of effect with each further stack. These items deserve mentioning because they stack extremely well despite having the more "standard" linear scaling.

So tl;dr: items stack infinitely. Some have a hard cap, some have diminishing returns, some have very bad scaling past the first stack and are better as a one-of, and some scale better the more you stack them.


Oh holy cow, this is overwhelming. I'm having an absolute blast with this game, more than I expected. Thanks for the answer :leatherneck:
Originally posted by Twista:
Oh holy cow, this is overwhelming. I'm having an absolute blast with this game, more than I expected. Thanks for the answer :leatherneck:

Cheers mate, have fun
Added note:
Only thing that can't stack indefinitely is Shaped glass. Over 127 stacks, floating point will round down your max hp to 0 :D
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Date Posted: Jul 21, 2025 @ 7:27am
Posts: 6