Currently adds the "refined diamond armor" which will protect us more than the netherite armor with a small cost which is that it takes away speed when equipping it. You can craft with "pure diamond" a mineral that is generated in the lower layers of the overword in the extreme hills biome.
It also adds the king's armor which protects less than the refined diamond armor, except for the crown which not only protects more but also gives us a life boost. This armor can be crafted with pure gold dust which is found in the deserts in the layers of the diamond.
The mod adds a new biome called "No Man's Land" a burned and forgotten biome without an owner where you can also find the mod's minerals in their respective layers.
This mod is in beta and therefore may have errors or bugs, any questions contact the creator.