ec2-18-204-229-70.compute-1.amazonaws.com | ToothyWiki | RecentChanges | Login | Webcomic The mystic substance upon which the plot is built to one degree or another. Can range from the whole story pivoting around it to just a 'That's cool' moment. Most take the form of the 'hardest' or 'sharpest' substance known in the world/universe/multiverse/local neighbourhood
A few things have Adamantium (notably Wolverine and the X-men universe, but I'm sure it's cropped up elsewhere)
Orihalcon (sp?) seems quite widespread (HyperPolice comes to mind)
Do you mean orichalcum?
Presumably. The RPGExalted has five magical materials, one for each class of heroes - orichalcum, moonsilver, starmetal, jade and soulsteel. Of these, only orichalcum and jade actually exist, although the description of starmetal suggests "iridium".
LastExile has Claudia, which may not be a power source but does rather help the flying ships keep flying. PatapataHikosenNoBouken? has, I'm told, magic blue sand which does about the same thing as Claudia.
From that, Claudia (Cloudia?) certainly sounds like the same thing; I expect it doesn't produce the same calibre of ColossalDeathWeaponry as the blue sand does, though.