A simple mod that adds one item, the Creature Catcher. Similar to ender leads, it allows you to pick up and store an entity in the item. You can then place them down where ever you like. by defualt does not work on vanilla 3 bosses, but can be configured via datapack tag to restrict any certain entity. This is my frist mod I have made after a long break from coding. This has not been tested on many modded entities, but should work.
Check out the GitHub https://github.com/MatthewAngie/NeoForge-BetterLead-1.21.1.git