Quick question: my character just hired fifty mercenaries. Is it the GM's job or mine to create identities for some of them? For example, if my character asks one of them for advice, am I allowed to come up with something about them, or just say "one of the mercenaries"?
If you want, you can make one or two of the mercenaries as you wish, however, for the rest however, I'll control them and make their backstories and such. Also, to answer your question about the wyverns, to buy one costs 100 gold pieces, so you would be able to afford about 180 wyverns...
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Also, to clarify the currency here in case some people still don't get it:
1000 bronze coins= 1 silver coin
1000 silver coins= 1 gold coin
1000 gold coins= 1 platinum coin
The platinum coin is the highest form of currency here and people who have them, are either nobles or expensive mercenary groups. A coin is no bigger than a regular american penny, no matter from what material it's made of.