12 lava blocks, 12 iron bars, 1 diamond block
Runic Armor piece
1 use, produces a bound rune block
When the bound rune is created, you can right click on the block with a piece of runic armor and the armor will be enchanted up to 5 times, each time either boosting the armor point or toughness
Right click the rune block with a runic armor piece, it will enchant the armor.