How much a mithral tower shield would actually weigh.


Homebrew and House Rules


So I have been reading through the posts on desire for mithral tower shields and I decided to do the math to amuse myself. I plugged the three shields listed that are either wood or metal into a graphing calculator and ran a best fit line. .2x^2 - 1.2x + 7 if you care. Using this, I got a weight of about 358 pounds for the steel shield. This would be a steel shield 4 feet tall by 2.5 feet wide by 1 inch thick, based on the density of steel. Value for density taken from aqua-calc .com. Mithral is listed as half the weight of steel. Thus a mithral tower shield should weigh 179 pounds.

Or you could get the unique +1 ghost touch arrow deflecting mithral tower shield that somehow only weighs 22 pounds in Ultimate Equipment.

Of course, that being a custom item, it cannot be augmented further, but it is a heck of a lot lighter!

The things I am willing to do for a +2 permissable Dex bonus to AC.


Because a mithral tower shield only weighs 22 pounds in pathfinder...

Also, I doubt that a tower shield is a solid hunks of steel.


Actually, after checking carrying capacity lists, 178 pounds isn't that bad for a character with 24 STR or higher. This may actually be feasible.


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Johnnycat93 wrote:

Because a mithral tower shield only weighs 22 pounds in pathfinder...

Also, I doubt that a tower shield is a solid hunks of steel.

Oh sure, realism makes this ridiculous. I was just laughing that at the listed weight of that shield it would be thinner than the tablet from which I am posting.


omegamage wrote:
Johnnycat93 wrote:

Because a mithral tower shield only weighs 22 pounds in pathfinder...

Also, I doubt that a tower shield is a solid hunks of steel.

Oh sure, realism makes this ridiculous, I was just laughing that at the listed weight of that shield it would be thinner than the tablet I am posting from.

I may be mistaken but the description in CRB notes that the shield is wooden.


Absolutely it does. Per mithral rules a standard item primarily made of wood gains no mechanical bonus for being made of mithral. That is why I did the calculation to make a steel shield first. It is also why I am posting in this forum rather than any of the rules questions or gameplay ones.


Steel, being much stronger than wood, would make the tower shield thinner for the same level of protection. A 1 inch thick steel shield (or for that matter, a 1 inch thick wood shield, except for maybe the center of the shield but not the whole thing) is ridiculous. Plate armor varied in thickness, but you were looking at around 1/8th of an inch at most.

From a rules standpoint, we do have2 things to work from. Light and heavy shields come in both wood and metal forms. Do a bit of math, and you see that the steel versions weigh between 1.2x the wood version (for light shields) to 1.5x (heavy version). Even if the ratio is larger for a steel tower shield, you are probably only looking at something 2x as heavy, so 90 pounds for a steel tower shield.


Jeraa wrote:

Steel, being much stronger than wood, would make the tower shield thinner for the same level of protection. A 1 inch thick steel shield (or for that matter, a 1 inch thick wood shield, except for maybe the center of the shield but not the whole thing) is ridiculous. Plate armor varied in thickness, but you were looking at around 1/8th of an inch at most.

From a rules standpoint, we do have2 things to work from. Light and heavy shields come in both wood and metal forms. Do a bit of math, and you see that the steel versions weigh between 1.2x the wood version (for light shields) to 1.5x (heavy version). Even if the ratio is larger for a steel tower shield, you are probably only looking at something 2x as heavy, so 90 pounds for a steel tower shield.

I have to disagree with you slightly. Bear with me for a second. The formula I obtained, see above, was by using the variable weight difference between wood and steel on all three shields listed (light, heavy, and quick draw). I didn't want to just arbitrarily create a ratio for wood to steel so I ran a best fit curve through those three points and extrapolated for a 45 pound tower shield. Then I checked density values to make sure my results were in the right ballpark.

Next, while you are sort-of right about armor thickness values, you are also sort-of wrong. Yes, full plate would have to be thin - especially around the joints - in certain areas and thicker in others. Equally, some shields would have a much thicker center than rim. Those would be round shields and would be designed that way to be well balanced and easy to carry. The variable thickness would also help reflect the force of blows by directing it away from the center. All correct and I agree with your point for them.

This is a tower shield. Effectively it is a mobile door (albeit a small one) and is intended to be able to cover you entirely from enemy fire (often literally in Pathfinder). Having any part be thinner would be to have a weak point immediately in front of some (hopefully non-essential) body part. That is the reason I gave the dimensions I did.

Double checking my math I did miss a dimension by a bit. The shield is actually only 4 feet by 2.14 feet by 1 inch. You may well be right that that is quite thick. Let me alter this a bit to 4.5 feet by 2.5 feet by .5 inch and use the remaining weight for grip and mounting. That does look better to me.


The idea that a tower shield can't be mithral because the description describes it as wooden is just RAWdicioulous. Hey, nice Greatsword. Whoa you say it's made out of coldiron? Sorry buddy, the weapon description doesn't say anything about metal, looks like it's made out of dreams and 2d6s- Good luck with the demons and stuff though!

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Vanilla tower shield (Masterwork)
45lbs
+4 AC
20 HP / 5 Hardness
Max Dex +2
ACP -9
Arcane Failure 50%
30GP +150GP to MW

Mithral tower shield (Masterwork by default)
22.5lbs
+4 AC
30HP / 15 Hardness
Max Dex +4
ACP -7 (Not sure if the MW property stacks here, Mith is always MW)
Arcane Failure 40%
30GP +1000GP (Probably closer to 2000GP)


Pathfinder Lost Omens, Rulebook Subscriber

A 1 inch thick steel shield is so out of the realm of realism that it boggles the mind. I would scoff at a half inch shield. A quarter inch I would start to consider. Do you have a ruler handy?

Steel is strong stuff, and the curve of the shield would make it much more structurally sound against an attack.


Though the description says "wooden", and honestly I have no idea why darkwood doesn't boost max dex bonus, outside of RAW I see no reason why a tower shield couldn't be plated with metal. Having a darkwood base with a relatively thin sheet on mithral on top would realistically provide good protection at roughly normal weights.

Ex, half the thickness of the wood and make it darkwood, you've got 1/4 of the normal weight for 0,5" thickness. Then tack on 1/8" thick mithral on top. By OP, a tower shield has a volume of 1440 cubic inches, for 179 pounds when 1" thick and 100% mithral. Divide that by 8, you've got 22,375 pounds. Plus the 0,5" darkwood, which is half of half the base weight, so 11,25lb. New total weight: 33,625lb. Price: 30gp+10gp+1000gp = 1040gp

But this is firmly in homebrew territory.


So after doing some research, the minimum thickness of steel which will consistently stop rifle rounds at 100 yards is 1 inch. Note that this is for mild steel, which is the most common variety of steel and is what I used for the density calculation.

The tower shield is based on the Roman septum, which was 4 feet by 2.5 feet. I will therefore keep those measurements. If I set a minimum of 10% of the total weight aside for handles and mounting, while remaining as close to one inch as possible within the previously calculated weight, I get a result of .77 inches thick.

Given the capacity of high STR characters to use piercing weapons, I feel this is not unreasonable. Final result: steel tower shield of 356 pounds 4 feet by 2.5 feet by .77 inches. Mithral tower shield of 178 pounds same dimensions.

Final price for mithral shield 89030 gold.


I'm not sure why you are looking at rifle rounds? No PF character uses rifle rounds. And the firearms that are used target touch AC: so your tower shield isn't meant to be able to stop bullets as, mechanically, it offers no protection against firearms whatsoever.

I would also remark that converting wood for mithral, which is 3 times heavier, without any adjustment to thickness, should absolutely not, in any way, increase the max dex bonus or reduce the ACP. The new 1" thick pure mithral shield is considerably heavier and harder to wield than a standard tower shield.

Unlike 1/2" of darkwood plated with 1/8" of mithral, which would actually be lighter than a normal tower shield, as well as thinner, while offering at least as much stopping power as a regular wooden tower shield.


Goblin_Priest wrote:
I'm not sure why you are looking at rifle rounds? No PF character uses rifle rounds. And the firearms that are used target touch AC: so your tower shield isn't meant to be able to stop bullets as, mechanically, it offers no protection against firearms whatsoever.

Normally, it doesn't give any protection. However, tower shields can grant cover, which does provide protection. It does require a standard action to use that way on each round you want the benefits however.


Johnnycat93 wrote:
omegamage wrote:
Johnnycat93 wrote:

Because a mithral tower shield only weighs 22 pounds in pathfinder...

Also, I doubt that a tower shield is a solid hunks of steel.

Oh sure, realism makes this ridiculous, I was just laughing that at the listed weight of that shield it would be thinner than the tablet I am posting from.
I may be mistaken but the description in CRB notes that the shield is wooden.

Sure, but it's not unreasonable to assume that Tower Shields can't be made of metal, either. There's weight issue as to why they're not common, perhaps, but that doesn't mean they don't exist.

I mean, what about the Force Tower magic item from Ultimate Equipment? Sure, it's a specific magic item, but logically speaking, in order to craft it, you'd first need a Mithril Tower Shield to enhance the properties onto it, and if you can't craft a Mithril Tower Shield, then this item should never exist.

This isn't like Celestial Armor (or Celestial Plate Armor), where the magical properties are what give it the reduced benefit, the material that the item in question is made out of is what's granting the benefits.

Silver Crusade

Omegamage--

I still find your calculations to be mind-bogglingly ridiculous. No medieval shield, tower or otherwise, was made to deal with modern high-velocity rifle rounds. As someone else already noted-- typical thickness for a steel shield (including tower shields) is probably 1/8" thick. Or, in the case of shields from the middle ages-- still wood with a thinner layer of metal over the top (usually). Also, try the calculations on just how freakin' heavy a "heavy" shield would actually BE if it were steel 1" thick!!!!!!!!

People made shields to resist sword and mace strikes, and maybe hits from arrows and crossbow bolts-- strong enough to do that? Strong enough to do the job.... figure THAT out, then figure a realistic thickness to accomplish that, and then let the rest of us know what you've found out-- maybe it'll make sense, maybe we'll find more holes in your conclusions.


Finn Kveldulfr wrote:

Omegamage--

I still find your calculations to be mind-bogglingly ridiculous. No medieval shield, tower or otherwise, was made to deal with modern high-velocity rifle rounds. As someone else already noted-- typical thickness for a steel shield (including tower shields) is probably 1/8" thick. Or, in the case of shields from the middle ages-- still wood with a thinner layer of metal over the top (usually). Also, try the calculations on just how freakin' heavy a "heavy" shield would actually BE if it were steel 1" thick!!!!!!!!

People made shields to resist sword and mace strikes, and maybe hits from arrows and crossbow bolts-- strong enough to do that? Strong enough to do the job.... figure THAT out, then figure a realistic thickness to accomplish that, and then let the rest of us know what you've found out-- maybe it'll make sense, maybe we'll find more holes in your conclusions.

A very fair request, and one I have a basic answer for. The best comparison I have been able to find rates a 300 pound draw crossbow (common in the late middle ages and a workable equivalent for a high STR rated composite longbow) as possessing similar penetrating capabilities to a 7.62 NATO round. Said rounds can be stopped by 3/8 inch mild steel. This would halve the weight.

I will go one better though, and point out that since mithral is half again as hard as steel, an equally defensive shield would only need to be 2/3 as thick. This would be a final result of 4 feet by 2.5 feet by .25 inches and would only weigh about 59.3 pounds.

While this is nowhere near as protective as I would like, a hardening spell and a nice enhancement bonus would resolve most of my worries. The new base price of 30030 gold is much nicer too.


30,000 gold for a Mithril Tower Shield?

Last I checked, the table lists Mithril Shields (which would include Tower Shields) as simply being a 1,000 gold markup that already includes Masterwork costs.


omegamage wrote:
Finn Kveldulfr wrote:

Omegamage--

I still find your calculations to be mind-bogglingly ridiculous. No medieval shield, tower or otherwise, was made to deal with modern high-velocity rifle rounds.

A very fair request, and one I have a basic answer for. The best comparison I have been able to find rates a 300 pound draw crossbow (common in the late middle ages and a workable equivalent for a high STR rated composite longbow) as possessing similar penetrating capabilities to a 7.62 NATO round. Said rounds can be stopped by 3/8 inch mild steel. This would halve the weight.

That's still a ridiculous benchmark.

As you point out, the tower shield is based on the Roman septum. You're comparing it, first, against the penetration of a modern rifle round, and second, against a late medieval heavy crossbow, against which the tower shield would have been a remarkably anachronistic weapon.


Orfamay Quest wrote:
omegamage wrote:
Finn Kveldulfr wrote:

Omegamage--

I still find your calculations to be mind-bogglingly ridiculous. No medieval shield, tower or otherwise, was made to deal with modern high-velocity rifle rounds.

A very fair request, and one I have a basic answer for. The best comparison I have been able to find rates a 300 pound draw crossbow (common in the late middle ages and a workable equivalent for a high STR rated composite longbow) as possessing similar penetrating capabilities to a 7.62 NATO round. Said rounds can be stopped by 3/8 inch mild steel. This would halve the weight.

That's still a ridiculous benchmark.

As you point out, the tower shield is based on the Roman septum. You're comparing it, first, against the penetration of a modern rifle round, and second, against a late medieval heavy crossbow, against which the tower shield would have been a remarkably anachronistic weapon.

Indeed, when the crossbow came out, it was villified for, namely, allowing a common untrained conscript to slay even the most well-trained and armored warrior. Shields and armor did not grant complete protection from projectiles.

Liberty's Edge

Considering the criteria and conclusions omegamage is posting, I have to wonder if he isn't just trolling ya'all.

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