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This may be silly but I started wondering about this after looking at this question: How does the Armored Kilt work?.

I have not been able to find an explicit rule that says all Medium armors reduce speed in a specific way (and similarly nothing on Heavy armors). Sure, armor lists show all medium armors slowing 30ft speed characters to 20ft and heavy armors doing the same plus reducing run speed... and yet, nowhere is it said explicitely.

My current thinking is that this may be a case of "too obvious to even mention it", or a case of "was mentioned in 3.5 and omitted, but still implied".

Also note that I'm aware this is barely a problem in general since almost every armor follows the same pattern and things that change an armor category tend to be specific enough about how it affects speed to avoid questions. This is more of a curiosity to me.

Can anyone confirm or disprove that there is a strict cause-consequence relation from armor category to speed reduction?


Here are some hints I have found:

  • In Equipment, we find the following statement:

Speed: Medium or heavy armor slows the wearer down. The number on Table: Armor and Shields is the character's speed while wearing the armor.

So it slows the wearer down. That's pretty final. There's just one thing that bothers me: it doesn't say how much nor does it give any details. It merely refers to the table. To me, this doesn't say "all Medium armors work that way and all Heavy armors work that other way", it rather says "each armor is unique and only a specific entry will tell you how much it slows you down".

  • The Armor tables always list the speed reduction (or lack thereof in the case of Light Armors or shields). Why list it if there's such an easy default rule for it? Convenience? Is it possible that some listed Medium Armors would not reduce speed? Or more or less than others?

  • The Fighter's Armor Training just cancels any armor speed penalty for a given category.

Armor Training (Ex): (...) a fighter can also move at his normal speed while wearing medium armor. At 7th level, a fighter can move at his normal speed while wearing heavy armor.

Admittedly, if armor categories had different effects on speed, this ability may have given a specific feet per round value such as "a fighter ignore 10 feet per round of speed penalty while wearing medium armor".

  • Barding has a table showing a generalized effect of armor category on speed... but only for animals?

  • What seems to be the single exception to uniform speed reduction of all Pathfinder: the Stoneplate Armor (Table here which lists a speed reduction of 30 to 15ft instead of the usual 20 (of note: it should also point out it reduces run speed, as other heavy armors). I'm not sure this is much of an argument for either case, but hey, it exists.

  • Mithral is an interesting case since it modifies the category of an armor but only for certain aspects:

Most mithral armors are one category lighter than normal for purposes of movement and other limitations. Heavy armors are treated as medium, and medium armors are treated as light, but light armors are still treated as light. This decrease does not apply to proficiency in wearing the armor.

Mithral could be a case for how changing categories changes speed reduction, but it has such a specific rule that I think it's hard to generalize. Also, it only applies to "most mithral armors".

  • Finally you have the very messy Armored Kilt (Table here) which can be used on its own, as light armor, without speed penalties according to the table (and following the unsaid rule)... or attached to light or medium armor, turning it into a whole new armor a category higher. That's all it says. One could assume it means proficiencies are affected and, possibly, speed reduction? It doesn't really give a hint towards either, sadly.

Note: I know I'm being very lawyerish on this. It's mostly because I like to understand what the RAW is before moving to RAI and house rules. Unless someone can find something saying speed reduction should not be applied uniformly across all armors, I will go with the general consensus anyway.

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I wouldn't say it's too obvious, it's simply implied. It's a good question actually, I think the armor table should be like in the barding instead of listing every armor individually and confusing people. –  Can Canbek Aug 29 '13 at 13:31
    
Useful gathering of information, but if a general rule for movement reduction by armor category existed, someone would have mention it as an answer for your first question, don't you think ? That would make this question a duplicate. –  Trajan Aug 29 '13 at 13:39
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@Trajan: I'd say it's related. I posted this as a question because I didn't want to "just assume" based on a lack of mention elsewhere. –  leokhorn Aug 29 '13 at 16:06
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I think the Mithral text "Most mithral armors are one category lighter than normal for purposes of movement and other limitations" implies that a typical speed exists for Medium and Heavy armor; otherwise that text is meaningless. –  Jeff Fry Feb 25 at 1:43
    
The Pathfinder Core Rulebook states on page 150 'Medium or heavy armor slows the wearer down. The number on Table 6–6 is the character’s speed while wearing the armor.' So, while it is implied that the armor is supposed to slow you down, the exact values are determined in the armor's stat line. –  HL971 Feb 26 at 20:26

4 Answers 4

up vote 10 down vote accepted

It’s very difficult to prove a negative, but I am reasonably confident that no rule in 3.5 or Pathfinder explicitly states that all armors of a given weight class slow you down by the same amount. In 3.5, at least, there were certainly a few super-heavy armors that reduced the speed by more than your typical heavy armor (Races of Stone had a couple of these).

So yes, every Medium or Heavy armor must somehow explicitly state its own speed reduction, even if the overwhelming majority of them have the same speed reduction. On the other hand, if a given case failed to do so, I’d just chalk that up to the designers not realizing there was no such general rule, since it usually is so consistent and armors which slow people more or less than others in their category are quite rare. It’s also worth keeping in mind that it is consistently weight category that we should consider, not sheer weight.

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So if you wear an armored kilt with light armor (making it heavy armor), it doesn't reduce your speed? This is a really big debate topic me and some of the other players in my group keep coming across... –  Flotolk Aug 29 '13 at 13:51
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@Flotolk Strict RAW? Yes. But more than likely that was a case of the authors themselves not realizing that there isn’t a general rule for this, because it is so consistent. –  KRyan Aug 29 '13 at 13:55
    
So, How would you treat this change in armor category? RAW, there are no speed deductions, but at what weight should speed start to drop? –  Flotolk Aug 29 '13 at 14:21
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Even if it weighs less than some light armors? –  Flotolk Aug 29 '13 at 14:41
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@Flotolk Yes; that even happens explicitly with printed armors in some cases. The penalties of higher weight category armors aren’t due solely to weight, they’re due in large part to how they restrict movements based on their construction. –  KRyan Aug 29 '13 at 14:42

RAW, there is no required speed change, it is usually specifically stated. However there some instances where the rules don't really cover what happens to your speed when you use a certain armor.

The best example is when you use the Armored Kilt with any light or medium armor.

  • RAW, you go up an armor category with no specifically called for speed change.
  • Logically, you are adding 10 more pounds to your armor, and your GM usually rules that your speed needs to drop.

So while the rules don't really call for a drop in speed, your GM will usually still call for one. How armor effects speed tends to vary between games, so the final call usually goes to the GM.

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In the pathfinder SRD it says "Medium or heavy armor slows the wearer down." It then points at the table, but I think that's because there are some exceptions where it slows you down even more... never less.

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I found this table from the Carrying Capacity section on the SRD which implies a general rule for light/medium/heavy penalties for both encumbrance AND armor.

Table: Armor and Encumbrance for Other Base Speeds The table below provides reduced speed figures for all base speeds from 5 feet to 120 feet (in 5-foot increments).

Link: http://www.d20pfsrd.com/alignment-description/carrying-capacity

(Scroll Down)

I will certainly use it as such since if you are supposed to rely on explicit table entries it all falls apart when the characters base speed is other than 20 or 30 feet. For example, the Barbarian class feature Fast Movement specifically calls out that it is applied to base speed before calculating reductions from armor worn.

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