Entity Crystal Knife

The Entity Crystal Knife is used to get a tag from an entity by attacking it with the knife. Once you got a tag the knife will glow. Now you can shift right-click on an Entity Jar to move the tag to it. If you shift right-click in the air you can remove the tag from your knife.

Recipe:

You just need to infuse a Crystal Knife Blade with a Tool Rod, a Iron Sword, a Eye of Ender and a piece of Blue Crystal Dust.