mythril affects lycanthrope like silver, does adamatite affect demons or devils and fae like cold iron?
By the RAW, no.
Different kettles of fish. Mithral has had silver connotation since Tolkien. Adamant's more mundane material connection would be to diamond, which it has had since the middle ages.
http://en.wikipedia.org/wiki/Adamant
Adamantine already overcomes DR/adamantine. As Frank said, mithral (or mithril, as it was known in Tolkien's works) has been known as "true-silver" since Tolkien (or maybe earlier).
Adamantine isn't really any form of iron. It's supposed to be a whole different form of metal - one that is extremely hard. In the real world "adamant" is not a specific substance, but a catch-all term for really hard stuff (just like unobtainium is a catch-all for expensive, rare or impossible stuff).
Cold iron is known for being cold-forged, which will really screw over those fairies.
Adamantine is so hard it cuts through stone and other lesser substances, which helps agianst golems and the like.
Adamantine already overcomes DR/adamantine. As Frank said, mithral (or mithril, as it was known in Tolkien's works) has been known as "true-silver" since Tolkien (or maybe earlier).
Would be hard, as Tolkien invented it for the Lord Of The Rings and retconned chain shirt from Hobbit into mithril (according to wiki, 1937 edition had silvered steel chain shirt presented to Bilbo).
Adamantine isn't really any form of iron. It's supposed to be a whole different form of metal - one that is extremely hard. In the real world "adamant" is not a specific substance, but a catch-all term for really hard stuff (just like unobtainium is a catch-all for expensive, rare or impossible stuff).
Adamant literaly means diamond in Greek since the ancient times. Johnatan Swift refers to adamant as the super-strong material from which flying city of Laputa support structure is made, without explaining if he means diamond or something else.