It wouldn't increase you actual dex, but I think if you make a medium armor to be treated as a light armor on accont of being a mithral armor and you have a dex modifier higher than 2, it would let you apply your full dex modifier to AC rather than just a +2 as per the rules for being lightly armored.

I found it in a wall

In the vast majority of cases, it does not.

There is only one exception; +1 mithral half-plate.

Theoretically these are seperate enchantments, but as a DM the world is your oyster.

(Personally i would remove the requirement that mithral be a magic armor) then the +1-3 works fine.

Definitely worth figuring out what your party wants in their armor choice, or campaign style first before giving it, otherwiae it will end up collecting dust if you dont enforce carry capacity.

no

So to people curious about the "light, flexible metal": It means the material is light and flexible, but it requires the same amount of weight of Mithral to other metals to make the armor, but it's magically able to allow you to stealth better.

I would consider armors constructed of Mithral count as an a lighter class of armor than normal due to its flexible nature counteracting inherent bulkiness. For example Plate Armor which is normally HEAVY would be considered MEDIUM ARMOR, and a Chain Shirt which is MEDIUM would be considered LIGHT ARMOR.  

does it say you can add your dex bonus? no? then theres your answer :3

Quote from OldManPsychic >>

I would consider armors constructed of Mithral count as an a lighter class of armor than normal due to its flexible nature counteracting inherent bulkiness. For example Plate Armor which is normally HEAVY would be considered MEDIUM ARMOR, and a Chain Shirt which is MEDIUM would be considered LIGHT ARMOR.  

 "A mithral chain shirt or breastplate can be worn under normal clothes. If the armor normally imposes disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the mithral version of the armor doesn't."

These are the only benefits. It doesn't say that it's a lighter class, just that it doesn't suffer the stealth and strength penalties. Ergo, the limits to Dexterity still apply.

RAW says mithral weighs half as much as steel, so the volume of metal for a pure steel item would be the same but the weight would be halved. I assume this is what makes it good for armor and stealthing, and that it is just assumed to be magical. It is kind of nitpicky, but if you can't nitpick in the dndbeyond comment section..., it ends up making big difference when calculating costs or loot at 50 gp a pound. I like to add material costs to rarity cost for item cost, it's an unspoken reminder that you can't buy rare mithral armor and sell the raw mithral for a profit.

the mithril-coat is worth more than the entire worth of the Shire!

Quote from doc_ketamine >>

What's the ruling on mithral armor and, say ... a rust monster?

 It's a magical item. Typically a DM would consider magical armor to be more durable than ordinary objects of it's kind, and increasing in difficulty to destroy the rarer you get.

I'd argue mundane rust can't affect it. I'd check for any indication of "magical items" in any effect that uses 'rust'.

So, what's the point of this armor if it has neither a STR requirement or stealth disadvantage? Just being somewhat valuable armor?

I'm trying to make a magic item similar to Elven Chain or Mithral Chain Shirt. The only appreciable difference is that I want to give the magic item:
[ AC = 13 + Full Dex Mod ]
instead of:
[ AC = 13 + Dex Mod (Max +2) ]

Is this even possible? I made it and gave it to a test character in my campaign but the dex mod bonus is still limited to +2 even though their Dex Mod is +3.

how do i give my charcter this

The Medium Mythral should have increased max dex mod is all I'm saying 😅

Quote from westward_man >>

Quote from pkline5 >>

Mithral does not seem to be inherently a magical metal, just uncommon. However, there does not seem to be a specific value attached to the armor for that rarity. When it comes to value for sale, the DMG (pg 135) puts Uncommon items at 101-500 gp.  The question seems to be, would you add that number to the value of the armor, or would that number replace it?

 

Mithral is inherently magical, which is why this is listed under magic items. It is an uncommon magic item. 

Magic Item Rarity

"Each magic item has a rarity: common, uncommon, rare, very rare, or legendary."

According to the table there, uncommon magic items are valued at 101gp - 500gp, but that doesn't mean your players can just go to the store and buy a set of mithral plate for 500gp. That's just a general rule of thumb for how much an item is worth, and is usually there to tell the players how much they can sell a magic item for, not how much they can buy it for.

It depends on the magic level of your game. So DMs like to play games that are very high magic where magical items are plentiful and shops sell them. That's totally fine. But in most games, magic items are rare, and you will have difficulty buying them. I think I would say you could after a week of investigation find a master dwarven armorsmith who will be willing to craft mithral armor for you. Either you need to bring him the raw mithral, which he will alloy with steel armor, or you're going to have to pay a lot.

Given that armor has value, I would say add 101 - 500gp to its normal value for the mithral version. But a person trying to sell an item is definitely going to mark that up. A full set of plate is normally 1500gp, so I would roll to see how much to add, then mark it up by 15%. 

The most important thing to consider is what fits the narrative and what is fun. If you think it's fun to let your players go buy mithral armor from a shop in a city, then by all means. Personally, I think magic items are more interesting when earned via a quest or adventure, or in this case seeking out someone who can craft it. In Forgotten Realms, the art of smelting mithral and alloying it with steel is a carefully guarded secret of certain dwarves, so you're unlikely to find a full set except maybe being sold in an auction by an eccentric collector, or collecting dust in some dwarven or elven ruins.

This is a pretty terrible interpretation. Value is NOT what things SELL for from the player, but from the stores.

Players are the "buyers" in the world. You do NOT buy something from a store for greater than its value. You SELL to the pawnshop or other buyer, for UNDER value. That's always been how that works. The listed value of an item tells you the MOST you should EVER pay for it. You get as good a price on it as you can bargain when selling.

As for the availablility of magical items, that should vary more than just "by the world". It also should vary by LOCATION. Even a low magic world is going to find that the capital city of the major kingdom has stuff like this for sale - albeit at likely higher prices since the world is low magic so the value should be different than in standard d&d which is high magic.

If you're people can buy this too early for your liking, you're giving them too much gold and/or not making them spend their money properly. There's a reason you're meant to track things like rations, so that they have enough food while travelling between locations. If you're not making them buy travel rations for them, their horses/pets/animal companions or whatever, and because of this they have more gold than they should even though you're following the proper treasure charts? That's your fault.

Also, you don't "add value" to the valued price. That's not how value charts work. The value chart is the actual cost period - unless it has some customized feature. Try looking at, for example, the blue book for how much a car is worth. You don't get to sell the car for more than that - unless your buyer is an absolute fool, or you have placed somethng special in it. Custom speakers, nitro, etc. The value price, is the price you bargain towards if you're the seller, or the price you bargain down from if you're the buyer. You don't get to just make up BS definitions because you don't like the prices.

If you want to change the prices as a DM, feel free - but don't provide BS reasons, just admit you are doing it because you don't like it. That's your absolute right as a DM, but you need to man/woman up and say it, instead of hiding behind fake definitions and trying to slide those made up claims by people like they're too stupid to know better.

Quote from MTG2DnD >>

When it says "Mithral is a light, flexible metal" would it mean it is lighter then the normal armor? It also says it's flexible, does that mean that you might be able to add more of your dexterity bonus? I am going to ask my DM about this.

That's because Mithril armor used to have the quality of being "one weight class lower than normal" so Mithril Plate was considered Medium Armor instead of Heavy Armor.

Now in 5e for some ridiculous reason they call it "Mithral" with an "a" and kept the "lore" but not the actual effect. It's dumb, like many of the changes they did in 5e that make no damn sense because they're trying to keep the lore while losing the differences, aka "have your cake and eat it too" and it just doesn't ******* work - you have to choose. Either things are different, or they are the same. But in trying to please "everyone" rather than just sticking to their guns, they made a mess of everything.

Quote from WillRosewall >>

Is this Mithral a whole set of armor  of itself or an attachment? . My DM and a lot of they friends say this is attachment ,but it not make any sense. Like heavy armor + Mithral attachment become light with no disadvantage ???

Nope, it's the whole armor... they have no idea what they're on about. It's Mithril - just like the metal from Lord of the Rings. An entirely different type of metal from normal steel.

My thoughts on this was taking the price and tripling it, and that's how much this would cost in a shop, if found.

500 GP being the standard selling price to the vendor.

Quote from Lunasmeow >>

Now in 5e for some ridiculous reason they call it "Mithral" with an "a" and kept the "lore" but not the actual effect. It's dumb, like many of the changes they did in 5e that make no damn sense because they're trying to keep the lore while losing the differences, aka "have your cake and eat it too" and it just doesn't ******* work - you have to choose.  

The reason is pretty simple. Mithril is a copyrighted term from Tolkien's work, which isn't public domain. Tolkien's estate doesn't seem to be as aggressive as some others when it comes to defend it, but it makes sense that a large company like WotC would prefer to be on the safe side.