They reset on each reincarnation. To earn more, you’ll be able to exchange black coins — but it won’t be as simple as visiting a bank, since those coins belong to a hostile kingdom.
That feature will be introduced in the next update.
No problem ☺️ You need to buy a shovel at the market when you pass the arch with the bandits. Then go to the cave. But some of the content of these branches still continues in versions 0.0.5-0.0.7