In MERP 8006 Treasures of Middle-earth, a compendium of Middle-earth magic items for MERP (a tabletop rpg), Adarcer is a material defined as:

This is a white alloy, a fusion of ang (iron), glôin ("True-coal"), and durang ("Dark-iron" or titanium). It's extremely strong, but somewhat rigid and difficult to work once forged. It can cleave iron without dulling.

In the Lord of the Rings ”fanon” fandom website, however, it's named Ardacer, with almost the same description:

Ardacer ('white alloy) was a white, metallic grey alloy of ang (iron), gloin ('true-coal' or carbon), durang ('dark-iron' or titanium) and probably magic, given that carbon steel cannot normally be alloyed with titanium. It had a high shine when polished, and was extremely strong, but somewhat rigid and difficult to work once forged. If worked properly, it could cleave iron without dulling. It was originally invented by the Dwarves. Commonly known as Dwarven steel, it was considered superior to elven steel.

I'm pretty sure the fandom entry is a typo, and the correct one is Adarcer, but I don't know.

Does anybody know the original source from Tolkien's work, so this can be clarified? Is it even something that Tolkien mentioned or it was invented by MERP writers?

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    Adarcer only appears in non-canon sources such as MERP so that is the primary source. – TheLethalCarrot Jan 27 '20 at 13:43
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    Note that the fandom wiki also spells it correctly elsewhere. It's just not a very reliable source. – TheLethalCarrot Jan 27 '20 at 13:46
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    This has nothing to do with Tolkien’s Legendarium and should be tagged with MERP instead. Note the Legendarium are those works written by Tolkien himself (including those edited by his son, Christopher) – Edlothiad Jan 27 '20 at 13:48
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    As you said you think we should keep the tag. I have done that but added the fan-fiction tag so it is clear this is from a third-party resource and not Tolkien – Edlothiad Jan 27 '20 at 14:44
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    @T.J.L. If you’re going to edit something discussed in the comments, leave a comment to explain your reasoning, it’s good practice imo. If you want to claim this question is about RPG books, add/create the relevant tags. As long as the tolkiens-Legendarium is the sole works tag it must be made clear this isn’t a work of tolkien’s – Edlothiad Jan 27 '20 at 16:37

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