Dear esteemed member of the Northern government,
You have been cordially invited to a discussion on trade policies between the South and the North. We need to establish better and more consistent rules for the exchange of goods. You would like to make use of our medallions and technology while we would like to make use of your metalborn. In addition, we think this meeting could be beneficial towards the general fostering of positive relations between all nations of the South. Thank you. Ple
The question is whether the elims can say 'We want CadCom to have a medallion', in which case he would receive a random medallion, or 'We want CadCom to have a nicrosil medallion', which would guarantee that Cadcom got a nicrosil medallion.
I'm fairly sure that pewter medallions work as Eternum describes, as opposed to a permanent extra life and the immediate destruction of all pewter medallions.