Hello, I am supposed to be able to upgrade Whelpling Crests for Drake Crests at Vaskarn. However I am not able to do this. I have the achievement Dreaming of Drakes but no such option is available. I have 298 of the Whelpling Crests available.
To add, I also have the achievement Dreaming of Wyrms and have the option to purchase 15 Wyrm Crests for 90 Whelpling Crests. but not for the level underneath so this appears to be a bug. Any guidance?
Just realised, I am capped on the Drake Crests, is it because the option to buy Drake Crests is removed because of my remaining capacity? Would be handier if it were just a greyed out option with tooltip text so I know why 
so as I learned the hard way today. Not only does it not show when you’re capped on the crest which you want to acquire, but once you buy the tokens and use them, it counts towards your cap. So on reset day, I ran over there to check if it was working properly, and now I have to spend less time farming m+, while still capped on the useless whelp and drake crest… That’s not very useful imo
When I mouseover any currency it tells me what the cap is and how many I have
I will double check when I cap but I think it goes red as well when I can’t acquire any more.