User blog comment:ChazmanianDevil/Mithril Swords/@comment-26347028-20160516205103/@comment-26347028-20160520153037

It's not a problem. The beta alloy has extremely low reactivity, and as such is in fact used in reaction chambers in jet engines. As in sure you're aware, low reactive metals can be found in their elemental form in the ground. For something to be expensive, it needs to either be strong or not tarnish. To make it as expensive as it is, Mithril is both. The titanium-aluminium beta alloys also are.

What else, then? Silver? That's idiotic.