For any new Spigot user looking at this post: Due my current health issues and my job, I'm unable to continue with this project properly, meaning that the project will lack on updates. Because of this, the plugin is currently available through the GitHub linked in this post, and the employed libraries are also available, meaning the project can be downloaded and modified at will. I'ld like to set this post free, but last time I tried it, it wasn't possible or it gave me lot of troubles, that's why it's set as 0.10USD, but you can actually download the released versions on GitHub.
About the plugin
The combination of simplicity and innovation in protections, Royale ProtectionBlocks gives you the simplicity of configuration, use and optimization, customization that others do not without the need for advanced knowledge.
Create the blocks with a single command, manage them through a menu that will make life easier.
Protection Block Creation System
Creation via a GUI (in-game) or file
Allows use in specific worlds
Allows you to create a recipe to create the block on a crafting table
Allows you to sell it, setting a price and using the Vault dependency