Hi everyone,
As I can see, the trait level up is very expensive, so I have a hard choice which troop to upgrade.
The question is where is the best place to farm high-level trait stones?
I have searched by the forum and didn’t find anything about. Maybe some guide exists.
Thanks 
Explore. Each kingdom has their own traitstone colour (although some colours are shared, for example blue/green has maugrim woods and merlantis.
Explore increases the chance of higher level traitstones (or it used to, the menu to see the chance drops isn’t visable anymore 
)
Yes, I see.
After 15 battles I didn’t get any higher level traitstone What the chance is?
Terribly poor. The last time I had to explore Drifting Sands for a yellow/brown stone, a single yellow/brown stone, it took me days.
I rather craft now than trying to farm small amounts and with larger amounts I don’t even bother and wait for glory trades.
The drop rate for arcane is 5.5% in explore, 1.5% everywhere else, according to sirrian in a recent dev stream