Looks like a great plugin, sadly doesn't work on 1.18. If you would update the plugin most defenetely a 5 star rating for such a simple but cool feature :)
The plugin should work on 1.16. Please open an issue on GitHub or PM me with server logs as well as whether or not the plugin worked on 1.15 if you are having trouble getting it to work!
Version: Version 1.2.1
The plugin works perfectly, glad that it fits with the vanilla theme of just using an anvil to get two enchantments that shouldn't be exclusive in the vanilla game in the first place. It doesn't work with JRE but other than that it's great. The dev was very helpful. 10/10