Kingdom of Tier

The Kingdom of Tier, which is the kingdom of the animal-headed population rely on Diamond as it is the only stone that can withstand their raw magic and be forged into weapons.

The other seventy-seven per cent of the population uses Opal for forging weapons. There are also smaller numbers of magic users that use other stones but they aren't important here yet.

The other stones are strong, but not as much as diamonds are to them.

That is the reason why they use diamonds the most. But ... diamonds cannot be found anywhere in the kingdom, so they have to import them.

The plus side to this is that there are several mines of Opal in the kingdom and they have been able to use that as one of their, many, trade source.

Now, Ace's kingdom has a couple of diamonds and the one diamond type, known as the Ren Diamonds, are widely desired.

Especially by the kingdom of Tier.