[He feels quick to add an addendum.]

I should say that while that is a sort of currency in my world, that does not mean I expect you to accept it. My blood may not be something anyone would wish to... collect.

[That's a lie. Great One blood is a hot commodity these days; but it's also dangerous, leading to horrific transformations and madness. Before, he would not have cared. But his humanity now dictates that he not be so reckless.]

Something else perhaps? I have a few small but glittering coins I've picked up in my travels.