[quote=@Burthstone]
[quote=@Demous]
they are called X-balls and it's never said where their from. I just looked at the page.
[/quote]

I know. So that makes it a houseruling thing, which Caits did.
[/quote]

Well, i imagine that they could be found in Edolas. Since why would the earthlanders need it in earthland?