Rune chamber

This is an old structure that is extremely hard to create: The Rune Chamber. First you get a mob into the iron chamber.
Next press the oak button to create a glass wall. Next chose the enchantment you want on the mob and put in the lapis lazuli. Finally press the stone button and watch as the mob is enhanced permanently. It takes Block of Iron, Block of Redstone, oak button, stone button, and an Enchanting Table to create. The glass appears when the oak button is pressed. Can be found in old ruins.