Adamantine 5e armor and Mithral magic items price
XGtE says, ” In 5e dnd, The adamantine version of a melee weapon or ten pieces of ammunition costs 500 gp more than the normal version. It applies to every condition, whether the weapon or ammunition is made of metal or coated with it. Mithral armor is a metal of its kind. Mithral Armor is classified as Uncommon, so the DMG values it at 101-500gp. Its description is “A fighter can wear mithral chain shirt or breastplate under normal clothes.” Adamantine 5e and Mithral armors appear under the “Magic Items” heading of the DMG and are present in magic item tables. Adamantine armor is pg. 150 They are magic items with all their attendant properties.
What does the handbook say about mithral 5e and adamantine?
There is no listing in the handbooks for adamantine weapons. It’s easy to see that the corresponding weapons can also be magic because the armors made of these materials are magical. Lore-wise, it can be justified by stating that mithral 5e and adamantine are magical materials in their nature. You can create magic items from adamantine, as well as non-magic ones. Although Adamantine Armor is listed in the DMG as a magic item for magical purposes, some items are made of adamantine that is not magic.
Mitral Armor 5e
Armor (medium or heavy, but not hide), uncommon
Mithral is a light, flexible metal. If the armor usually imposes a disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the mithral version of the armor doesn’t. Gargoyles are resistant to damage from a “nonmagical weapon that isn’t adamantine.” (MM, p 140). That would imply that there are nonmagical weapons other than adamantine.
|Medium||Chain Shirt||13 + Dex modifier (max 2)||—||—|
|Medium||Scale Mail||14 + Dex modifier (max 2)||Disadvantage||—|
|Medium||Breastplate||14 + Dex modifier (max 2)||—||—|
|Medium||Half Plate||15 + Dex modifier (max 2)||Disadvantage||—|
|Heavy||Chain Mail||16||Disadvantage||Strength 13|
Adamantine weapons strike gargoyles the same way magic weapons do, but they are not magic weapons or magic items. They are similar to silvered weapons (the phrasing is the same in monsters’ resistances blocks). Still, they defeat a different set of monsters’ damage resistances.
Xanathar’s guide does not consider Adamantium to be “Magical.”
Xanathar’s guide to everything (p. 78) has a section about adamantium weapons. It describes adamantine as “an ultrahard metallic found in meteorites or extraordinary mineral veins” but doesn’t mention magical.
Xanathar lists the properties and coatings of weapons made from or coated with adamantine. These properties are different from magic item properties. Adamantine weapons, for example, don’t have magic item resilience. WGtE refers to adamantine as a rare metal that is found in meteorites or exceptional mineral veins. So lore-wise, it is a different natural metal from Adamantium.
Are the oozes corroding adamantine? Based on the description of the effect in the monster’s guide, it appears that adamantine is a naturally occurring metal.
Is adamantine 5e a ferrous metal?
If it is a rare, precious, and unique metal, Adamantine wouldn’t have iron or be affected by rust monsters. Adamantine armor in 5e reduced critical hits to normal hits. Adamantine weapons also default score criticals against objects. Are there any benefits to adamantine-shielded 5e? Even though I don’t know much about 3e, Adamantine things in 3e are considered masterworks.
Adamantine armor, which is a magic item, is safe. It’s the first item on the DMG Magic Item List. An adamantine shield or weapon would share this property.
5e adamantine can not be considered a ferrous metal. Although it’s not iron, it doesn’t specify if it’s a pure substance or an amalgam of some kind (which could contain some iron). It seems unlikely that it is a rare and strange material (found in meteorites and rare mineral deposits). It would not be possible to mass-produce if it were an iron alloy.
A brief description of adamantine weapons is found in Xanathar’s Guide to Everything. It states that it doesn’t matter if the weapon or ammunition is made from metal or coated. The cost of ammunition or weapons is the same. The adamantine could be used to cover the surface. It is similar to how you might silver a blade’s edge but leave the weapon’s core made from a more malleable material.
To protect the iron from oxidation, you must create a thick layer that is insurmountable by rust. It is how stainless steel works: you passivate the material to make enough of an impermeable, non-reactive layer. That could be ruled out by adamantine. It doesn’t appear to have a particular rule.
Rust monsters can be devastating due to this power. However, it is best to exercise caution when removing cool stuff. Some players prefer to take ability damage over losing certain magic items.
There is no official 5E material that has ever mentioned an adamantine shield. The rules are very vague regarding mithral 5e items. Outside of the magic armor, there are no mentions of mithral within the core rules. A DM might take adamantine’s lead, a rare metal often found in magic objects. They might declare it magical. Your DM can define custom items.
An item listed as a magical item will generally have the same qualities as magic items of its type. Your DM may have additional properties for a custom item. Your DM can determine the specific qualities of each item in your game. Your character may (and should) be able to determine whether an item is a magic or not. They can also learn about its properties, resistances, and other details by using an Identify spell.
Adamantine (5e weapon) has a particular property that acts the same way as a gargoyle or magical. It’s not unreasonable to conclude that adamantine has an inherent magical quality. The answer to your question raises an interesting point. It may be that a ruling is the only way to solve it.