You Are Late To The Challenge!
This exchange meant I could use higher grade bones safely to secure my needs. The higher the bone grade was, the higher the exchange rate would be.
It seemed profitable to exchange higher grade bones. But come on! How often would I get such bones?
Not to mention their amount in my inventory wasn't as much to get me what I wanted!
"Sigh! I had to go all out using my blue, silver, and gold bones first with my green ones. Then I'll worry myself about other types of bones," I decided to purchase the basic necessities first.
I upgraded the castle to level ten, the towers also to level ten. I added twelve more towers at the castle, making the total number there reach fifteen.
Then I scattered five towers at each path. I also upgraded the armour and weapons of my soldiers to level fifty, adding magic and flying soldiers to the mix.