The World // Zero perk rating system is a way to judge how strong a perk roll is compared to its maximum possible value. A higher percentage does not always mean the same thing for every perk, because each perk has its own range.
This guide explains how S+, S, A, B, and C tier perk ratings work using the supplied examples for Glass, Boss Bane, and Vampiric. It is meant to help players quickly decide whether a perk roll is worth keeping, upgrading, or replacing later.
Quick Answer
S+ tier: The perfect perk roll, meaning the absolute highest value possible.
S tier: A near-perfect roll, usually 1% or 2% away from perfect depending on the perk range.
A tier: A strong roll below S tier.
B tier: A usable mid-range roll.
C tier: A lower roll within the perk's possible range.
How Perk Ratings Work
Perk ratings compare a roll to the best possible value for that specific perk. The best possible value is rated S+. Rolls close to perfect are rated S, while lower rolls fall into A, B, or C depending on their value.
Because perk ranges are different, the same rating cannot be judged by one universal percentage. For example, Glass has a much wider range than Vampiric, so the rating thresholds are different.
Perk Rating Tiers
Tier | Meaning |
|---|---|
S+ | Perfect perk value. This is the absolute highest value that can roll for the perk. |
S | Near-perfect value. For smaller ranges, this is usually 1% away from perfect. For larger ranges, this can be 1% to 2% away from perfect. |
A | Strong value below S tier. These rolls are usually worth keeping while farming for better gear. |
B | Middle value. These rolls can be usable, but they are not close to perfect. |
C | Low value within the perk range. These rolls are usually replacement targets when better gear becomes available. |
S+ Tier Explained
S+ is the perfect perk value. It means the perk rolled at the absolute maximum value available for that perk. For example, 100% Glass, 30% Boss Bane, and 15% Vampiric are listed as S+ examples.
S+ rolls are the cleanest rating because they do not depend on thresholds. If the perk has the maximum possible value, it is S+.
S Tier Explained
S tier is used for rolls close to perfect. The supplied rating notes separate perks by the size of their range. If a perk's range is 15 or less, S tier accepts values 1% away from perfect. If a perk's range is more than 15, S tier accepts values 2% away from perfect.
This means a wide-range perk such as Glass can have more S tier values than a narrower perk such as Vampiric.
Example Rating Table
The supplied rating examples use Glass, Boss Bane, and Vampiric to show how different perk ranges affect rating thresholds.
Tier | Glass | Boss Bane | Vampiric |
|---|---|---|---|
S+ | 100% | 30% | 15% |
S | 98% - 99% | 28% - 29% | 14% |
A | 85% - 97% | 25% - 27% | 13% |
B | 64% - 84% | 19% - 24% | 10% - 12% |
C | 30% - 63% | 10% - 18% | 5% - 9% |
Glass Rating Example
Glass has a supplied range of 30% - 100%. A 100% Glass roll is S+, while 98% - 99% Glass is S tier. Glass rolls from 85% - 97% are listed as A tier, 64% - 84% as B tier, and 30% - 63% as C tier.
Because Glass has a large range, the S tier rating accepts values up to 2% away from perfect. This is why both 98% and 99% are listed as S tier values.
Boss Bane Rating Example
Boss Bane has a supplied example range of 10% - 30%. A 30% Boss Bane roll is S+, while 28% - 29% Boss Bane is S tier. Boss Bane rolls from 25% - 27% are A tier, 19% - 24% are B tier, and 10% - 18% are C tier.
Boss Bane is an example of a perk where the rating depends heavily on the perk range. A 25% Boss Bane roll is not perfect, but it is still listed as A tier in the supplied example.
Vampiric Rating Example
Vampiric has a supplied example range of 5% - 15%. A 15% Vampiric roll is S+, while 14% Vampiric is S tier. A 13% roll is A tier, 10% - 12% is B tier, and 5% - 9% is C tier.
Because the Vampiric range is smaller, S tier only accepts a value 1% away from perfect. This makes 14% Vampiric S tier, while 13% Vampiric is A tier.
How to Use Ratings When Farming
When farming perks, the rating system helps players decide whether to keep or replace a roll. S+ is ideal, but S and A tier rolls can still be useful, especially when the perk type fits the player's build.
A lower-rated perk can still be useful if it is the correct perk for the activity. For example, a lower Boss Bane roll may still help against bosses until a higher roll is found.
Perfect Rolls vs Useful Rolls
A perfect roll is not always required for progression. Perfect rolls are valuable for optimized builds, but useful rolls can still support farming, bossing, and general play. The best approach is usually to get the correct perk type first, then improve the value over time.
Players chasing S+ rolls should expect a longer farming process, especially for rare perks with low listed drop rates.
Is the Perk Rating System Worth Using?
Yes. The rating system is useful because it gives players a quick way to compare perk values without guessing. It is especially helpful for deciding whether a roll is close enough to perfect or should be replaced later.
The rating system is most useful when combined with perk effects. A high rating on the wrong perk may be less useful than a slightly lower rating on a perk that directly supports the player's build.
FAQ
What does S+ mean for perks in World // Zero?
S+ means the perk has the perfect value, which is the highest possible roll for that perk.
What does S tier mean for perks?
S tier means the perk is close to perfect. Depending on the perk range, this can be 1% or 2% away from the perfect value.
What is an A tier perk roll?
An A tier roll is a strong roll below S tier. It is not perfect, but it is usually still worth using if the perk fits the build.
What is the S+ roll for Glass?
The S+ roll for Glass is 100%.
What is the S+ roll for Boss Bane?
The S+ roll for Boss Bane is 30% in the supplied rating example.
What is the S+ roll for Vampiric?
The S+ roll for Vampiric is 15% in the supplied rating example.
Should I replace a B tier perk?
A B tier perk can be usable, especially if it is the correct perk for your build. It is still a good target to replace later with an A, S, or S+ roll.
Is a perfect perk always necessary?
No. Perfect perks are ideal for optimized builds, but strong non-perfect rolls can still be useful for farming, dungeons, and progression.
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Notes: Values, requirements, drop rates, locations, and mechanics may change in future World // Zero updates.