Difference between revisions of "Encumbrance rating"
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''For shield encumbrance, see [[Shields]]. Not to be confused with [[encumbered|encumbrance]] from inventory [[aum|weight]], an obsolete mechanic.'' | ''For shield encumbrance, see [[Shields]]. Not to be confused with [[encumbered|encumbrance]] from inventory [[aum|weight]], an obsolete mechanic.'' | ||
An '''encumbrance rating''' is a penalty applied to [[body armour]]. The heavier your armour, the higher the encumbrance rating. The higher the encumbrance, the higher the penalty is to [[ev]]asion, [[spell failure|spellcasting]], [[stealth]], and [[ranged weapon]]s. Encumbrance can be mitigated, but not removed, by [[strength]] and [[Armour skill]]. | An '''encumbrance rating''' is a penalty applied to [[body armour]]. The heavier your armour, the higher the encumbrance rating. The higher the encumbrance, the higher the penalty is to [[ev]]asion, [[spell failure|spellcasting]], [[stealth]], and [[ranged weapon]]s. Encumbrance can be mitigated, but not removed, by [[strength]] and [[Armour skill]]. | ||
| − | + | This page exclusively covers body armour. Certain other armours may "encumber" you, but use different mechanics. | |
| − | * [[Barding]]s have a -2 [[EV]] penalty. This does not penalize casting, stealth, etc., and cannot be reduced by strength / armour skill. | + | *[[Barding]]s have a -2 [[EV]] penalty. This does not penalize casting, stealth, etc., and cannot be reduced by strength / armour skill. |
| − | * [[Shields]] also have an encumbrance | + | *[[Shields]] also have an encumbrance rating, but it's handled entirely differently. See [[Shields#Shield Penalties|Shields]] for more details. |
See the [[Armour#Tables of Armours|Table of Armours]] for numerical details on all items with encumbrance ratings. | See the [[Armour#Tables of Armours|Table of Armours]] for numerical details on all items with encumbrance ratings. | ||
==Base Penalty== | ==Base Penalty== | ||
| − | Body armour has a "base" penalty of:<ref>{{source ref|0. | + | Body armour has a "base" penalty of:<ref>{{source ref|0.31.0|player.cc|5892}}</ref> |
[[File:Base AEVP.png|716px]] | [[File:Base AEVP.png|716px]] | ||
Where: | Where: | ||
| − | * "S" = scale. Scale essentially equals to 1 (100/100), meaning it has no impact the final result. It is used to increase the precision of encumbrance calculations. | + | *"S" = scale. Scale essentially equals to 1 (100/100), meaning it has no impact the final result. It is used to increase the precision of encumbrance calculations. |
| − | * "armour" = [[Armour skill]] and "str" = [[strength]]. | + | *"armour" = [[Armour skill]] and "str" = [[strength]]. |
This equation can be simplified into the following form: | This equation can be simplified into the following form: | ||
| Line 31: | Line 31: | ||
===EV Penalty=== | ===EV Penalty=== | ||
| − | Encumbrance will lower your EV by:<ref>{{source ref|0. | + | Encumbrance will lower your EV by:<ref>{{source ref|0.31.0|player.cc|5887}}</ref> |
[[File:Simplified_AEVP_EV.png|771px]] | [[File:Simplified_AEVP_EV.png|771px]] | ||
| Line 42: | Line 42: | ||
For '''Dodging Bonus''' = <code>(8 + 0.8 × Dodging × Dex) / (20 - size_factor)</code>. See [[Evasion]] for more detail. | For '''Dodging Bonus''' = <code>(8 + 0.8 × Dodging × Dex) / (20 - size_factor)</code>. See [[Evasion]] for more detail. | ||
| − | This Dodging Bonus is then multiplied by a modifier | + | This Dodging Bonus is then multiplied by a modifier:<ref>{{source ref|0.31.0|player.cc|2122}}</ref> |
| − | + | [[File:Dodging pen1.png|350px]] | |
| − | [[File:Dodging pen1.png| | ||
| − | + | For e = encumbrance. If (e-3) is 0 or lower, then there's no penalty to Dodging. | |
| − | |||
| − | |||
| − | For e = encumbrance. If (e-3) is 0 or lower, then Dodging | ||
==Spellcasting Penalty== | ==Spellcasting Penalty== | ||
| − | Encumbrance increases "spellFailure", which is not to be confused with your chance of actually failing a spell:<ref>{{source ref|0. | + | Encumbrance increases "spellFailure", which is not to be confused with your chance of actually failing a spell:<ref>{{source ref|0.31.0|player.cc|2166}}</ref><ref>{{source ref|0.31.0|spl-cast.cc|410}}</ref> |
[[File:Simplified AEVP spell.png|660px]] | [[File:Simplified AEVP spell.png|660px]] | ||
| Line 59: | Line 55: | ||
As a reference: | As a reference: | ||
| − | * 1 [[intelligence]] = -2 spellFailure | + | *1 [[intelligence]] = -2 spellFailure |
| − | * 1 [[Spellcasting]] skill = -3 spellFailure | + | *1 [[Spellcasting]] skill = -3 spellFailure |
| − | * 1 (Spell School) skill = -12 spellFailure, divided by the number of schools of a spell | + | *1 (Spell School) skill = -12 spellFailure, divided by the number of schools of a spell |
"SpellFailure" is then transformed multiple times to determine your actual chance of failure. See [[spell success]] for details. | "SpellFailure" is then transformed multiple times to determine your actual chance of failure. See [[spell success]] for details. | ||
==Stealth Penalty== | ==Stealth Penalty== | ||
| − | Encumbrance reduces your [[stealth]] score:<ref>{{source ref|0. | + | Encumbrance reduces your [[stealth]] score:<ref>{{source ref|0.31.0|player.cc|3112}}</ref> |
[[File:StealthPenalty.gif]] | [[File:StealthPenalty.gif]] | ||
| Line 73: | Line 69: | ||
==Ranged Weapon Penalty== | ==Ranged Weapon Penalty== | ||
| − | Encumbrance slows down [[Ranged Weapons]] (but not [[Throwing]] weapons). It increases the [[attack delay]] of these weapons, in units of [[decaAut]]:<ref>{{source ref|0. | + | Encumbrance slows down [[Ranged Weapons]] (but not [[Throwing]] weapons). It increases the [[attack delay]] of these weapons, in units of [[decaAut]]:<ref>{{source ref|0.31.0|player-act.cc|360}}</ref> |
[[File:AdjustedRangedPenalty.png|610px]] | [[File:AdjustedRangedPenalty.png|610px]] | ||
| Line 82: | Line 78: | ||
In general: | In general: | ||
| − | * Armour skill has a linear impact on encumbrance. Every point in Armour reduces encumbrance by -2.2%. | + | *Armour skill has a linear impact on encumbrance. Every point in Armour reduces encumbrance by -2.2%. |
| − | * Strength has a logarithmic impact on encumbrance. | + | *Strength has a logarithmic impact - i.e. a diminishing return - on encumbrance. For everything except the Dodging penalty, going from 7 -> 17 strength will give the same % reduction as 2 -> 7 strength, which has the same reduction as 17 -> 37 strength. |
===On Evasion=== | ===On Evasion=== | ||
| Line 98: | Line 94: | ||
! Strength !! % of Dodging !! Delta | ! Strength !! % of Dodging !! Delta | ||
|- | |- | ||
| − | |5 || 31.25% || | + | |5 || 31.25% || |
! | ! | ||
| − | |12 || 40.0% || | + | |12 || 40.0% || |
|- | |- | ||
|6 || 37.5% || +6.25% | |6 || 37.5% || +6.25% | ||
| Line 127: | Line 123: | ||
|} | |} | ||
Note, again, that this is '''only the impact on Dodging bonus'''. Remember that there is ''another'' EV penalty on top of this. Overall, every point of strength will give less EV than the previous point of strength. (Of course, you should still have high strength if you plan to wear heavy armour). | Note, again, that this is '''only the impact on Dodging bonus'''. Remember that there is ''another'' EV penalty on top of this. Overall, every point of strength will give less EV than the previous point of strength. (Of course, you should still have high strength if you plan to wear heavy armour). | ||
| + | |||
| + | ===On Spellcasting=== | ||
| + | ====Armour skill vs Spell skill==== | ||
| + | *Encumbrance increases SpellFailure by <code>19/225 * encumbrance^2 * (90 - 2armour) / (str+3)</code>. This can be rearranged to <code>-armour * 38/225 * encumbrance^2 / (str+3)</code>. | ||
| + | *Having 1 of every spell school (except Spellcasting) reduces SpellFailure by 12. | ||
| + | *Therefore, each level in Armour is worth <code>19/1350 * encumbrance^2 / (str+3)</code>, or roughly <code>1/71 * encumbrance^2 / (str+3)</code>, levels in each spell school. | ||
| + | |||
| + | For example, if you have 11 strength and [[fire dragon scales]], 1 Armour skill = <code>1/71 * 11^2 / 14</code> = 0.122 levels in each spell school. This is a ratio of 8.21 Armour skill : 1 in each spell school. If you have a dual-school spell, like [[Iron Shot]], 4.1 Armour skill = 1 Earth Magic OR 1 Conjurations, while 8.21 Armour = 1 Earth AND Conjurations. | ||
| + | |||
| + | Of course, this analysis does '''NOT''' include the fact that Armour increases your [[AC]] and [[EV]]. You may want to train Armour for those reasons, or train spell schools to increase power. | ||
| + | |||
| + | ====Strength vs Intelligence==== | ||
| + | *For a given change in strength 'x', strength reduces SpellFailure by <code>(1/<str+3> - 1/<str+x+3>) * 19/225 * encumbrance^2 * (90 - 2armour)</code>. | ||
| + | *Intelligence reduces SpellFailure by 2 per point. | ||
| + | |||
| + | For example, you have 11 strength, fire dragon scales, and 0 Armour skill. On level up, you have a choice of 2 str or 2 int. The impact of +2 str is equal to <code>(1/14 - 1/16) * 19/225 * 11^2 * 90</code> = 8.21 SpellFailure, greater than 2*2 = 4 SpellFailure from intelligence. | ||
| + | |||
| + | Of course, intelligence also increases [[spell power]], while strength also reduces [[shield]] encumbrance. | ||
==Spreadsheet== | ==Spreadsheet== | ||
| Line 132: | Line 146: | ||
==History== | ==History== | ||
| − | *Ranged weapon | + | *Ranged weapon penalties were added in [[0.29]]. |
| − | *Armour to-hit | + | *Armour to-hit penalties were removed in [[0.28]]. Specifically, they were: |
[[File:ToHitPenalty.gif]] | [[File:ToHitPenalty.gif]] | ||
*Armour no longer slows down unarmed melee attacks, and some of the mathematics have changed between 0.13 and 0.17. | *Armour no longer slows down unarmed melee attacks, and some of the mathematics have changed between 0.13 and 0.17. | ||
Latest revision as of 21:55, 2 June 2024
For shield encumbrance, see Shields. Not to be confused with encumbrance from inventory weight, an obsolete mechanic.
An encumbrance rating is a penalty applied to body armour. The heavier your armour, the higher the encumbrance rating. The higher the encumbrance, the higher the penalty is to evasion, spellcasting, stealth, and ranged weapons. Encumbrance can be mitigated, but not removed, by strength and Armour skill.
This page exclusively covers body armour. Certain other armours may "encumber" you, but use different mechanics.
- Bardings have a -2 EV penalty. This does not penalize casting, stealth, etc., and cannot be reduced by strength / armour skill.
- Shields also have an encumbrance rating, but it's handled entirely differently. See Shields for more details.
See the Table of Armours for numerical details on all items with encumbrance ratings.
Contents
Base Penalty
Body armour has a "base" penalty of:[1]
Where:
- "S" = scale. Scale essentially equals to 1 (100/100), meaning it has no impact the final result. It is used to increase the precision of encumbrance calculations.
- "armour" = Armour skill and "str" = strength.
This equation can be simplified into the following form:
While this equation is not used directly, it is used to determine most of the other penalties.
Evasion
Encumbrance rating has two effects on EV:
- Encumbrance will directly lower your evasion. This is reduced by armour skill and strength.
- Encumbrance will lower the effect of Dodging skill on evasion. This penalty is only reduced by strength.
EV Penalty
Encumbrance will lower your EV by:[2]
This number is subtracted directly from your EV score.
Dodging Penalty
Encumbrance will also reduce the EV gained by Dodging skill and dexterity.
For Dodging Bonus = (8 + 0.8 × Dodging × Dex) / (20 - size_factor). See Evasion for more detail.
This Dodging Bonus is then multiplied by a modifier:[3]
For e = encumbrance. If (e-3) is 0 or lower, then there's no penalty to Dodging.
Spellcasting Penalty
Encumbrance increases "spellFailure", which is not to be confused with your chance of actually failing a spell:[4][5]
As a reference:
- 1 intelligence = -2 spellFailure
- 1 Spellcasting skill = -3 spellFailure
- 1 (Spell School) skill = -12 spellFailure, divided by the number of schools of a spell
"SpellFailure" is then transformed multiple times to determine your actual chance of failure. See spell success for details.
Stealth Penalty
Encumbrance reduces your stealth score:[6]
Independent of armour skill or strength. This does not reduce the Stealth skill, so encumbrance doesn't impact the strength of stabs, nor does it impact the use of atropa and datura darts.
Ranged Weapon Penalty
Encumbrance slows down Ranged Weapons (but not Throwing weapons). It increases the attack delay of these weapons, in units of decaAut:[7]
This penalty is rounded to the tenths place in a weighted fashion, then added to your attack delay. Note that, because these are in units of decaAut, the equation is divided by 10. If you want regular aut, multiply by 10.
Analysis
In general:
- Armour skill has a linear impact on encumbrance. Every point in Armour reduces encumbrance by -2.2%.
- Strength has a logarithmic impact - i.e. a diminishing return - on encumbrance. For everything except the Dodging penalty, going from 7 -> 17 strength will give the same % reduction as 2 -> 7 strength, which has the same reduction as 17 -> 37 strength.
On Evasion
As mentioned above, strength has a diminishing return on encumbrance as a whole. But there exists a clear breakpoint, e - 3 = str, where the dodging penalty shifts from 1 equation to another. Beyond this point, strength starts to drop more rapidly. This breakpoint only applies to Dodging, not to casting or the general EV penalty.
This is the basis behind a rule of thumb, where strength should at least be the same number as encumbrance. However, this is not a hard rule. More strength is still likely to have a noticeable impact. And, if you don't have any Dodging skill, then str = (e-3) has next-to-no significance to your character.
The % of Dodging Bonus is tabulated below, as an example:
| Fire dragon scales (e=11) | Plate armour (e=18) | |||||
|---|---|---|---|---|---|---|
| Strength | % of Dodging | Delta | Strength | % of Dodging | Delta | |
| 5 | 31.25% | 12 | 40.0% | |||
| 6 | 37.5% | +6.25% | 13 | 43.3% | +3.3% | |
| 7 | 43.75% | +6.25% | 14 | 46.6% | +3.3% | |
| 8 | 50% | +6.25% | 15 | 50% | +3.3% | |
| 9 | 55.5% | +5.5% | 16 | 53.1% | +3.1% | |
| 10 | 60% | +4.5% | 17 | 55.9% | +2.8% | |
| 11 | 63.6% | +3.6% | 18 | 58.3% | +2.4% | |
Note, again, that this is only the impact on Dodging bonus. Remember that there is another EV penalty on top of this. Overall, every point of strength will give less EV than the previous point of strength. (Of course, you should still have high strength if you plan to wear heavy armour).
On Spellcasting
Armour skill vs Spell skill
- Encumbrance increases SpellFailure by
19/225 * encumbrance^2 * (90 - 2armour) / (str+3). This can be rearranged to-armour * 38/225 * encumbrance^2 / (str+3). - Having 1 of every spell school (except Spellcasting) reduces SpellFailure by 12.
- Therefore, each level in Armour is worth
19/1350 * encumbrance^2 / (str+3), or roughly1/71 * encumbrance^2 / (str+3), levels in each spell school.
For example, if you have 11 strength and fire dragon scales, 1 Armour skill = 1/71 * 11^2 / 14 = 0.122 levels in each spell school. This is a ratio of 8.21 Armour skill : 1 in each spell school. If you have a dual-school spell, like Iron Shot, 4.1 Armour skill = 1 Earth Magic OR 1 Conjurations, while 8.21 Armour = 1 Earth AND Conjurations.
Of course, this analysis does NOT include the fact that Armour increases your AC and EV. You may want to train Armour for those reasons, or train spell schools to increase power.
Strength vs Intelligence
- For a given change in strength 'x', strength reduces SpellFailure by
(1/<str+3> - 1/<str+x+3>) * 19/225 * encumbrance^2 * (90 - 2armour). - Intelligence reduces SpellFailure by 2 per point.
For example, you have 11 strength, fire dragon scales, and 0 Armour skill. On level up, you have a choice of 2 str or 2 int. The impact of +2 str is equal to (1/14 - 1/16) * 19/225 * 11^2 * 90 = 8.21 SpellFailure, greater than 2*2 = 4 SpellFailure from intelligence.
Of course, intelligence also increases spell power, while strength also reduces shield encumbrance.
Spreadsheet
See this spreadsheet (and/or make a copy) for an armour penalty calculator: Calculator (outdated as of 0.27)
History
- Ranged weapon penalties were added in 0.29.
- Armour to-hit penalties were removed in 0.28. Specifically, they were:
- Armour no longer slows down unarmed melee attacks, and some of the mathematics have changed between 0.13 and 0.17.
- Encumbrance ratings were introduced in 0.13, replacing the EV penalty system.
References
- ↑ player.cc:5892 (0.31.0)
- ↑ player.cc:5887 (0.31.0)
- ↑ player.cc:2122 (0.31.0)
- ↑ player.cc:2166 (0.31.0)
- ↑ spl-cast.cc:410 (0.31.0)
- ↑ player.cc:3112 (0.31.0)
- ↑ player-act.cc:360 (0.31.0)
