The Enchantment book of Undying, allows you to be alive like a totem of undying but applying to armor only. You can find that book in survival in desert temple or buried treasure with chance ~30%. And you can apply it by using anvil. You can optionaly use only 1 armor element without any other. By the way, with ~5% chance you can find a zombie or skeleton which has a random element of armor with Undying enchant, but, the totem for zombie or a skeleton is works only 3 times, and you have ~3% chance by killing you can get his armor element with Undying enchant.
